Mocks — real difficulty, personal concepts

Why your mock score predicts, and still teaches.

A mock's difficulty is anchored to the real thing: μ_paper comes from the measured difficulty of dated JEE Main papers, never personalised — otherwise the score stops predicting. The intelligence lives in which concepts appear: 35% of each paper re-tests concepts you missed or left, served as fresh variants of those concepts, never the same question again.

PYQs are excluded from mocks entirely — prior exposure inflates scores. JEE Advanced mocks run /360 with the real marking scheme, per-subject qualifying floors, and a published marks→rank lookup. Your concept ledger is fed by every surface — practice, quiz, chapter test, mock — so the paper gets smarter about you test by test.