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Academic discussion and doubt solving for: Logarithms, Set Theory, Matrices & Determinants, Permutation & Combination, Probability, Binomial Theorem
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there are many free channels but ive used PW its rely good and basics if u wanna start then u can watch from 10th grade.I feel its the foundation start and later u can improvise by working on some basic to advance problems.
I watched Nishant Vora's JEE lectures. They helped.