Everything you need for placements
Start anywhere, or follow the roadmap. CS Theory is free to read; every other module has free lessons so you can judge the quality first.
CS Theory
Operating systems, DBMS, computer networks and OOP — the four subjects every placement interview checks.
DSA Basics
Ninety problems that build loop, array and string fluency — from warm-ups to exam-level questions.
NeetCode 150
The 150 problems that cover every interview pattern, explained from brute force to optimal, with NeetCode's video for each.
Story Problems
Ninety-four long-form problems written like real online-assessment questions, grouped by the pattern they hide.
SQL
Seventy questions on one realistic database, run on a real PostgreSQL engine inside your browser.
Aptitude
Quantitative, logical and verbal aptitude by topic, with formula sheets, worked solutions and timed mocks.
System Design
The building blocks of large systems and the classic interview case studies, drawn out step by step.
Machine Learning
From the maths to transformers — the ML you need for data science, ML engineering and AI roles.