How to Prepare for Campus Placement Coding Tests: A 90-Day Roadmap

Most students start preparing for placement season three weeks before the first company arrives on campus. That is the single biggest reason good students miss offers they were capable of getting. Coding tests reward consistent practice, not last-minute cramming — and 90 days is enough time to go from "I know syntax" to clearing most service-based and many product-based company tests.

Days 1–30: One language, real fluency

Pick one language — Python, Java or C++ — and stop switching. Interviewers do not care which one you choose; they care that you can use it without looking things up.

• Solve 2–3 easy problems every day: arrays, strings, loops, basic math.
• Type every solution yourself and run it against real test cases. Reading solutions builds recognition, not skill.
• Learn your language's standard tools cold: sorting with a comparator, hash maps, string builders, reading input from stdin.

By day 30 you should be able to solve an easy problem end-to-end — read, code, test, fix — in under 15 minutes.

Days 31–60: Data structures and patterns

Placement tests repeat the same patterns year after year. Cover them deliberately, one week at a time:

1. Hashing and frequency counting
2. Two pointers and sliding window
3. Recursion, then binary search
4. Stacks, queues and linked lists
5. Trees and basic graph traversal (BFS/DFS)

Aim for 2 medium problems a day. When you get stuck for more than 40 minutes, read the approach — not the code — and implement it yourself.

Days 61–90: Simulate the real test

The last month is about test conditions, because the test environment fails more candidates than the questions do.

• Take a full-length timed mock every weekend: 2–3 problems in 60–90 minutes, webcam on if your college uses proctored tests.
• Practice with stdin/stdout style judging — many campus tests grade on exact output, and unfamiliarity with input parsing wastes precious minutes.
• Review every mock the same day: wrong answers teach more than new problems.

The mistakes that cost offers

• Grinding hard problems too early. Companies mostly ask easy–medium; consistency beats difficulty.
• Ignoring aptitude and English rounds. Many candidates clear coding and fail communication assessments — practice those too.
• Never coding under a timer. Knowing a topic and finishing it in 25 minutes are different skills.

Ninety days of honest, tracked practice puts you ahead of the large majority of your batch. Start today, not three weeks before the drive.