Dear student,

There are many special books for Calculus Maths. But if you go for such a book then you will find so much content in it . You will find such topics, that don't come even in JEE Mains and JEE Advance. So never go for that book. Just choose that book, that contains relevant topics as per your exam. So you can go for ' Mathematics by Cengage' book for JEE Mains. It has good theory and good problems for calculus. Alongwith it, you can also solve RD Sharma Objective Maths.

MS Chauhan Organic Chemistry is a good book to prepare for both JEE Mains and JEE Advance. It is a conceptual book. It contains proper theory and good problems. But if you want only numerical problems book for organic, then you can go for Organic Chemistry by SKM. This is also a good book.

Hope this helps.