Step 1 · Learn concepts

Choose a subject to learn

Every tutorial explains the idea, shows code, and points you to practice questions when you're ready.

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Aptitude & Reasoning

24 topics · screening round

Quant, logical reasoning and verbal ability with formulas, shortcut tricks, solved problems and timed speed tests.

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Core CS Subjects

OS · DBMS · CN · OOP

Cheat sheets, comparison tables, top interview questions and quizzes for technical rounds.

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Data Structures & Algorithms

21 topics · Placement core

Arrays, linked lists, trees, graphs, DP and more — with complexity tables and interview problems.

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Python

Beginner → Advanced

Python fundamentals to advanced topics with runnable examples and quizzes.

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Java

17 topics · Beginner → Expert

Basics, OOP, collections, streams, concurrency, JVM internals and design patterns.

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C++

15 topics · Beginner → Expert

OOP, STL, smart pointers, move semantics, templates, concurrency and modern C++.

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C

15 topics · Beginner → Expert

Pointers, dynamic memory, structures, files, bit tricks and memory layout.

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SQL (MySQL)

18 topics · Beginner → Expert

SELECT to joins, window functions, indexing, transactions and expert interview patterns.

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PySpark

15 topics · Beginner → Expert

DataFrames, joins, windows, partitioning, tuning, Delta Lake and streaming.

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