Placement · DSA & coding interview · Product & tech companies (coding rounds)

DSA & Coding Interview Mock Tests, Syllabus & Complete Exam Guide

Q: What do product-company coding rounds test?

Data structures and algorithms, judged on correctness, the right time and space complexity, and clear reasoning. The recurring areas are arrays/strings/hashing, linked lists/stacks/queues, trees/graphs/searching, and recursion/sorting/dynamic programming.

Q: Is there negative marking?

No. In real rounds a brute-force or partial answer simply scores below an optimal one. On ExamguruX these auto-graded questions are +1 with no penalty, so attempt every one.

Q: Do these MCQs replace writing real code?

No — they build the concepts, code-tracing and complexity skills fast, but the actual rounds require writing and running working programs on a judge. Use these first, then solve full problems.

Q: Which companies is this for?

Product and tech companies where coding rounds are DSA-heavy — Amazon, Google, Microsoft, Flipkart, Adobe, fintechs and many startups. The company-wise roadmap shows each one's exact process.

Q: How do I prepare the behavioural rounds?

Use the company-wise Placement Interview roadmap, which links each company's behavioural round — Amazon's Leadership Principles, Google's Googleyness and the rest — to record-and-model practice.

Q: How should I use these tests?

Drill the topic tests to make each DSA area automatic and to get fast at complexity, then take full-length timed tests. Finish your prep by writing real solutions on a coding judge under time.

Data Structures & Algorithms — Product-Company Coding Interview. Practise 32 full-length mock tests on the official pattern, drill every topic, and get the eligibility, syllabus, cut-off, rank and college details you need — all in one place.

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DSA & Coding Interview at a glance

Areas: Arrays · Linked lists/Stacks · Trees/Graphs · DP
Purpose: Online assessment + coding interview rounds
Marking: No negative marking · efficiency matters
For: Amazon, Google, Microsoft, Flipkart, Adobe & more

ModeOnline assessments & live coding rounds

FrequencyCompany-specific (placement & off-campus drives)

LanguagesEnglish (C, C++, Java or Python)

By the ExamguruX Editorial TeamReviewed for pattern accuracy against Product & tech companies (coding rounds)Last updated 10 August 2026

DSA & Coding Interview full-length mock tests

Attempt 32 full-length DSA & Coding Interview mock tests built on the official 52-question pattern. The first mock is free — every test comes with instant results and a step-by-step solution for each question.

DSA & Coding Practice Test 01

Free

52 Qs · 52 marks60 min13.1K attemptsModerate

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DSA & Coding Practice Test 02

52 Qs · 52 marks60 min17.1K attemptsHard

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DSA & Coding Practice Test 03

52 Qs · 52 marks60 min21.2K attemptsModerate

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DSA & Coding Practice Test 04

52 Qs · 52 marks60 min25.2K attemptsHard

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DSA & Coding Practice Test 05

52 Qs · 52 marks60 min29.3K attemptsEasy

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DSA & Coding Practice Test 06

52 Qs · 52 marks60 min33.3K attemptsHard

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DSA & Coding Practice Test 07

52 Qs · 52 marks60 min37.4K attemptsEasy

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DSA & Coding Practice Test 08

52 Qs · 52 marks60 min41.4K attemptsModerate

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DSA & Coding Practice Test 09

52 Qs · 52 marks60 min45.5K attemptsEasy

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Try the first full-length mock free. Get the complete DSA & Coding Interview mock library, every topic test and all available languages for 3 months — a one-time ₹399 / 3 months.

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DSA & Coding Interview topic-wise tests & syllabus

120 topic tests across 4 subjects — a focused set of 15 tests for every topic in the DSA & Coding Interview syllabus, tagged with approximate exam weightage so you practise where the marks are.

120 topic-wise tests · 15 per topic across 4 subjects. Pick a subject, expand a topic, and start drilling.

Arrays, Strings & Two Pointers — Test 01

10 Qs · 10 marks15 min106K attemptsModerate

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Arrays, Strings & Two Pointers — Test 02

10 Qs · 10 marks15 min135K attemptsEasy

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Arrays, Strings & Two Pointers — Test 03

16 Qs · 16 marks24 min163K attemptsHard

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Arrays, Strings & Two Pointers — Test 04

10 Qs · 10 marks15 min191K attemptsModerate

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Arrays, Strings & Two Pointers — Test 05

10 Qs · 10 marks15 min19.7K attemptsEasy

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Arrays, Strings & Two Pointers — Test 06

16 Qs · 16 marks24 min48.0K attemptsHard

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Arrays, Strings & Two Pointers — Test 07

10 Qs · 10 marks15 min76.4K attemptsModerate

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Arrays, Strings & Two Pointers — Test 08

10 Qs · 10 marks15 min105K attemptsEasy

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Arrays, Strings & Two Pointers — Test 09

16 Qs · 16 marks24 min133K attemptsHard

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Arrays, Strings & Two Pointers — Test 10

10 Qs · 10 marks15 min161K attemptsModerate

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Arrays, Strings & Two Pointers — Test 11

10 Qs · 10 marks15 min190K attemptsEasy

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Arrays, Strings & Two Pointers — Test 12

16 Qs · 16 marks24 min18.2K attemptsHard

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Arrays, Strings & Two Pointers — Test 13

10 Qs · 10 marks15 min46.5K attemptsModerate

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Arrays, Strings & Two Pointers — Test 14

10 Qs · 10 marks15 min74.9K attemptsEasy

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Arrays, Strings & Two Pointers — Test 15

16 Qs · 16 marks24 min103K attemptsHard

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DSA & Coding Interview sample questions

A few real DSA & Coding Interview questions with answers and step-by-step solutions, in the exact style of the full mock tests.

Arrays, Strings & HashingSample 1

What is the output of: def rotate(a, k): n = len(a) k = k % n a[:] = a[n - k:] + a[:n - k] return a print(rotate([1, 2, 3, 4, 5], 2))

A.[1, 2, 4, 5, 3]
B.[4, 5, 1, 2, 3]
C.[3, 4, 5, 1, 2]
D.[2, 3, 4, 5, 1]

Solution: Right-rotating by k=2 moves the last 2 elements to the front. a[n-k:] is a[3:] = [4, 5] and a[:n-k] is a[:3] = [1, 2, 3], so the result is [4, 5] + [1, 2, 3] = [4, 5, 1, 2, 3].

Linked Lists, Stacks & QueuesSample 2

Which technique detects a cycle in a singly linked list using only O(1) extra space?

A.Storing every visited node in a hash set (this needs O(n) space)
B.Sorting the node addresses and scanning for duplicates
C.Floyd's tortoise-and-hare: advance one pointer by 1 and another by 2 until they meet
D.Reversing the list twice and comparing

Solution: Floyd's cycle detection moves a slow pointer one step and a fast pointer two steps; if a cycle exists they eventually meet, all in O(1) extra space. A hash set also detects cycles but uses O(n) space, so it fails the constraint.

Trees, Graphs & SearchingSample 3

In a binary search tree (BST), the left subtree of any node contains only values that are:

A.Greater than the node's value
B.Less than the node's value
C.Equal to the node's value
D.Unordered relative to the node

Solution: The BST invariant says every key in a node's left subtree is smaller than the node, and every key in its right subtree is larger. This ordering is what makes searching, inserting, and deleting efficient.

Recursion, Sorting & Dynamic ProgrammingSample 4

What is the output of: def fib(n): if n < 2: return n return fib(n - 1) + fib(n - 2) print(fib(6))

A.6
B.13
C.8
D.5

Solution: The Fibonacci sequence starting at fib(0)=0 is 0, 1, 1, 2, 3, 5, 8, so fib(6) = 8. (This naive recursion recomputes subproblems, which is why memoization matters.)

About the DSA & Coding Interview exam

The data-structures-and-algorithms practice that product companies — Amazon, Google, Microsoft, Flipkart, Adobe and more — test in their online assessments and coding interview rounds.

What product-company coding rounds test

Companies like Amazon, Google, Microsoft, Flipkart and Adobe hire mostly on data structures and algorithms. Their online assessment usually has one or two coding problems on a judge, and shortlisted candidates face two to four live DSA interview rounds where you solve a problem while explaining your thinking. The bar is not just a working answer — it is the optimal answer, at the right time and space complexity, communicated clearly.

The recurring content is remarkably consistent: array and string manipulation with two pointers and sliding windows, hashing, linked lists, stacks and queues, trees and graphs with their traversals and searches, and recursion, sorting and dynamic programming — all underpinned by Big-O analysis. Build these until they are automatic, and most coding rounds become a matter of recognising which pattern applies.

How to use this with the company roadmap

Use these tests to drill the DSA concepts and code-tracing skills the rounds are built on, and to get fast at spotting the right data structure or algorithm and its complexity. Then move to writing and running full solutions on a coding judge, since the real rounds require working code, not a chosen option.

For the rounds that surround the coding — the behavioural ones — open the company-wise Placement Interview roadmap. It shows each company's exact process and links its behavioural round (Amazon's Leadership Principles, Google's Googleyness, and the rest) to record-and-model practice.

DSA & Coding Interview eligibility & exam pattern

Check whether you meet the DSA & Coding Interview eligibility criteria and understand exactly how the paper is structured and marked before you plan your preparation.

Eligibility criteria

Who it's for: Students and freshers targeting product/tech companies where coding rounds are DSA-heavy.
Prerequisites: Comfort with one language (C, C++, Java or Python) and the basics of data structures.
What it covers: The four core DSA areas plus time/space complexity that recur across coding rounds.
Beyond MCQs: For real coding rounds you must also write and run full programs on a judge; use this to build the underlying concepts and speed.
Pairs with: The company-wise Placement Interview roadmap for the behavioural rounds (Amazon Leadership Principles, Google Googleyness, and so on).
Practice cadence: Little and often — a topic a day, then full timed tests before a drive.

Exam pattern & marking

Subject	Questions	Marks
Arrays, Strings & HashingTwo pointers, sliding window, hashing, complexity	varies	—
Linked Lists, Stacks & QueuesList operations, stack applications, queues/deques	varies	—
Trees, Graphs & SearchingBST, traversals, BFS/DFS, binary search	varies	—
Recursion, Sorting & Dynamic ProgrammingBacktracking, sorting, DP, greedy, complexity	varies	—
Total	NaN	52

Product-company coding rounds are not marked like an MCQ paper — they judge whether your solution is correct, whether it runs in the right time and space complexity, and how clearly you reason through it. Online assessments typically give one or two problems on a judge; interview rounds are live. There is no negative marking, but a brute-force answer scores below an optimal one. On ExamguruX these are auto-graded multiple-choice questions on the exact concepts and code-tracing skills those rounds test — output prediction, complexity analysis, and the right data structure or algorithm for a problem — each with +1 and no penalty and a worked explanation.

Duration: About 60–90 minutes (per online assessment).

How to prepare for DSA & Coding Interview

A fresher-friendly DSA & Coding Interview roadmap — understand the paper first, follow a month-by-month plan, build a weekly routine and peak with reviewed full-length mocks.

Beginner-friendly roadmap

Your DSA & Coding Interview plan: first day to exam day

Start with the paper structure, build concepts in layers, then use timed practice and review to turn preparation into a repeatable score.

Coverage4 subjects

Exam clockAbout 60–90 minutes (per online assessment)

MarkingProduct-company coding rounds are not marked like an MCQ paper — they judge whether your solution is correct, whether it runs in the right time and space complexity, and how clearly you reason through it. Online assessments typically give one or two problems on a judge; interview rounds are live. There is no negative marking, but a brute-force answer scores below an optimal one. On ExamguruX these are auto-graded multiple-choice questions on the exact concepts and code-tracing skills those rounds test — output prediction, complexity analysis, and the right data structure or algorithm for a problem — each with +1 and no penalty and a worked explanation.

The first 12 weeks

A plan a fresher can actually follow

Have less than three months? Keep the sequence and shorten each phase rather than skipping mock review.

Month 1
Understand the paper and build your base
Read the official pattern first, then make a realistic subject map for 4 subjects. Begin with Arrays, Strings & Hashing, Linked Lists, Stacks & Queues, Trees, Graphs & Searching. Focus on concepts before speed.
Take one diagnostic topic test. Its purpose is to find gaps, not to judge your score.
Month 2
Finish the core syllabus through practice
Cover the remaining syllabus, including Recursion, Sorting & Dynamic Programming, while revising Month 1 every week. Move from untimed questions to short timed sets.
Keep a single error log: concept missed, why it happened and the correct method.
Month 3
Build exam temperament with mocks
Use the real exam time limit (About 60–90 minutes (per online assessment)) in full-length practice. Review every mock longer than it took to attempt it; the review is where improvement happens.
Turn each weak area from your error log into a 30–45 minute repair session.

Your repeatable week

The study loop that makes revision stick

1
Learn
Read one focused concept block and make a short revision sheet.
2
Solve
Immediately answer topic questions; do not wait until you have ‘finished’ the syllabus.
3
Review
Log mistakes by concept, not just by score. Revisit them after 2–3 days.
4
Simulate
Use a timed section or mock to practise decisions under the clock.

Mock-test ladder

Don’t start with a full mock every day

Month 1: topic tests after each completed concept.
Month 2: one timed sectional test each week, plus error-log revision.
Month 3: one or two full mocks weekly under the real About 60–90 minutes (per online assessment) clock.

DSA & Coding Interview-specific priorities

What to focus on as you move through the plan

1
Recognise the pattern, not the problem
Most DSA questions are a variation of a known pattern — two pointers, sliding window, BFS/DFS, binary search, DP. Practise until you recognise which applies within seconds.
2
Always state the complexity
Interviewers expect you to give and justify the time and space complexity of every approach, and to improve a brute-force answer toward optimal. Make Big-O second nature.
3
Master the core structures
Arrays, strings, hashing, linked lists, stacks, queues, trees, graphs and heaps — know their operations, costs and the problems each is best for.
4
Drill recursion and DP
Recursion, backtracking and dynamic programming trip up most candidates. Practise identifying overlapping subproblems and optimal substructure, and writing the recurrence.
5
Explain while you solve
Coding rounds score communication too. Practise thinking aloud — clarifying the problem, stating your approach, then coding — rather than going silent.
6
Then write real code on a judge
These MCQs build the concepts fast; finish by solving full problems on a coding judge under time, since the actual rounds require working, tested code.

Final 7 days

Revise your short notes and error log; do not begin major new topics.

Take only the number of mocks you can properly review; protect sleep and routine.

Confirm the official admit-card instructions, reporting time, centre and permitted items.

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Request an online trainer for your DSA & Coding Interview preparation.

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How DSA rounds are judged

Use this practice benchmark to understand score ranges, qualifying cut-offs and the selection stages for DSA & Coding Interview. The conducting authority sets official merit and appointments.

DSA & Coding Interview marks vs. rank

Score range	Area	What it tests
Optimal + clear	Strong hire	Correct, efficient, well-communicated solutions
Correct but brute-force	Borderline	Works, but not the expected complexity
Right pattern, minor bugs	Fixable	Recognise the approach; tighten the code
Struggles on core DSA	Not yet	Rebuild arrays, trees and recursion first
Consistent timed practice	Readiness	Steady practice is the best predictor

Core DSA areas

Arrays, Strings & HashingCore

Indicative marks: Two pointers, sliding window, hashing

Linked Lists, Stacks & QueuesCore

Indicative marks: List manipulation, stack/queue uses

Trees, Graphs & SearchingCore

Indicative marks: Traversals, BFS/DFS, binary search

Recursion, Sorting & DPCore

Indicative marks: Backtracking, DP, greedy, complexity

Complexity (Big-O)Throughout

Indicative marks: Judge and improve every approach

Coding-round formats differ by company and change over time — the number of problems, the judge, and whether there is a machine-coding or system-design round vary. The content here reflects the core data-structures-and-algorithms and complexity concepts that commonly recur across product-company coding rounds; always confirm a specific company's current format before a drive.

Companies that test DSA in coding rounds

Product companies hire almost entirely on data structures and algorithms: an online assessment of one to two coding problems, then two to four live DSA interview rounds, plus a behavioural round. This practice covers the core DSA that recurs across those rounds; pair it with the company-wise interview roadmap for the behavioural specifics.

Company	Coding round	Behavioural	Typical bar
Amazon	2 coding + DSA rounds	Leadership Principles	Strong DSA + LP alignment
Google	3–4 DSA interviews	Googleyness & Leadership	Excellent algorithms
Microsoft	DSA + LLD	HR / AA round	DSA + design + communication
Flipkart	DSA + machine coding	Hiring Manager	DSA + clean working code
Adobe	DSA + CS fundamentals	HR	DSA + OS/DBMS/OOP
Fintech (Paytm, Razorpay)	DSA + system design	HR	DSA + design basics
Goldman Sachs	Coding + technical	Behavioural (Superday)	DSA + fundamentals
Startups & product teams	DSA + practical build	Founder/HM round	DSA + shipping ability

A representative view of companys and selection routes linked to DSA & Coding Interview. Confirm vacancies, stages and final appointments in the current official notice.

DSA & Coding Interview important dates

The typical DSA & Coding Interview timeline, from notification to counselling. Dates are tentative until the official notification is released.

Placement season
Typically August–March
Online assessment
One or two coding problems on a judge
DSA interview rounds
Two to four live problem-solving rounds
Behavioural round
Leadership Principles / Googleyness / HM
Offer
After the final round
Off-campus
Same content — apply year-round

DSA & Coding Interview — frequently asked questions

Quick, reliable answers to the questions DSA & Coding Interview aspirants ask most.

What do product-company coding rounds test?

Data structures and algorithms, judged on correctness, the right time and space complexity, and clear reasoning. The recurring areas are arrays/strings/hashing, linked lists/stacks/queues, trees/graphs/searching, and recursion/sorting/dynamic programming.

Is there negative marking?

No. In real rounds a brute-force or partial answer simply scores below an optimal one. On ExamguruX these auto-graded questions are +1 with no penalty, so attempt every one.

Do these MCQs replace writing real code?

No — they build the concepts, code-tracing and complexity skills fast, but the actual rounds require writing and running working programs on a judge. Use these first, then solve full problems.

Which companies is this for?

Product and tech companies where coding rounds are DSA-heavy — Amazon, Google, Microsoft, Flipkart, Adobe, fintechs and many startups. The company-wise roadmap shows each one's exact process.

How do I prepare the behavioural rounds?

Use the company-wise Placement Interview roadmap, which links each company's behavioural round — Amazon's Leadership Principles, Google's Googleyness and the rest — to record-and-model practice.

How should I use these tests?

Drill the topic tests to make each DSA area automatic and to get fast at complexity, then take full-length timed tests. Finish your prep by writing real solutions on a coding judge under time.

Start your DSA & Coding Interview preparation today

Take your first full-length mock free, see your predicted rank, and let the analysis show you exactly what to fix next.

Start free

DSA & Coding Interview Mock Tests, Syllabus & Complete Exam Guide

DSA & Coding Interview at a glance

DSA & Coding Interview full-length mock tests

DSA & Coding Practice Test 01

DSA & Coding Practice Test 02

DSA & Coding Practice Test 03

DSA & Coding Practice Test 04

DSA & Coding Practice Test 05

DSA & Coding Practice Test 06

DSA & Coding Practice Test 07

DSA & Coding Practice Test 08

DSA & Coding Practice Test 09

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DSA & Coding Interview topic-wise tests & syllabus

Arrays, Strings & Two Pointers — Test 01

Arrays, Strings & Two Pointers — Test 02

Arrays, Strings & Two Pointers — Test 03

Arrays, Strings & Two Pointers — Test 04

Arrays, Strings & Two Pointers — Test 05

Arrays, Strings & Two Pointers — Test 06

Arrays, Strings & Two Pointers — Test 07

Arrays, Strings & Two Pointers — Test 08

Arrays, Strings & Two Pointers — Test 09

Arrays, Strings & Two Pointers — Test 10

Arrays, Strings & Two Pointers — Test 11

Arrays, Strings & Two Pointers — Test 12

Arrays, Strings & Two Pointers — Test 13

Arrays, Strings & Two Pointers — Test 14

Arrays, Strings & Two Pointers — Test 15

DSA & Coding Interview sample questions

About the DSA & Coding Interview exam

What product-company coding rounds test

How to use this with the company roadmap

DSA & Coding Interview eligibility & exam pattern

Eligibility criteria

Exam pattern & marking

How to prepare for DSA & Coding Interview

Your DSA & Coding Interview plan: first day to exam day

A plan a fresher can actually follow

Understand the paper and build your base

Finish the core syllabus through practice

Build exam temperament with mocks

The study loop that makes revision stick

Don’t start with a full mock every day

What to focus on as you move through the plan

Recognise the pattern, not the problem

Always state the complexity

Master the core structures

Drill recursion and DP

Explain while you solve

Then write real code on a judge

Request an online trainer for your DSA & Coding Interview preparation.

How DSA rounds are judged

DSA & Coding Interview marks vs. rank

Core DSA areas

Companies that test DSA in coding rounds

DSA & Coding Interview important dates

DSA & Coding Interview — frequently asked questions

Start your DSA & Coding Interview preparation today