Permutations & Combinations
Counting principles, arrangements, selections, distribution, derangements, and multinomial theorem. One of the trickiest chapters but high weightage.
Formula Sheet
All formulas grouped by subtopic - key identities, properties, and theorems for Permutations & Combinations.
Top Question Types
12 recurring patterns - the most common ways this chapter appears in JEE Main.
Timed Quiz
10-question sprint or full 20-question chapter test. Timer, scoring, explanations, weak-topic tags. Score 80%+ before moving on.
Visual Solutions
Step-by-step animated solutions with key insights. Watch how each problem unfolds.
Practice by Concept
4 key concepts identified. Filter questions by concept to target weak areas.
PYQ Pack
2018-2026 previous year questions. Filtered by session, difficulty, and subtopic. Solved + unsolved modes.
Common Mistakes
Sign errors in conjugates, forgotten domain restrictions, wrong modulus formulas, time-wasting approaches.
Your Progress
Questions attempted, accuracy, weak subtopics, time per question. Track your improvement over time.