In my opinion Chemistry is the the most scoring part of JEE. For preparing IIT JEE Chemistry you must cover all the NCERT Books first. NCERT Books are must for building a stronger base of concepts. For Physical and Inorganic Chemistry, NCERT Books are one of the best and they have enough content to get you through JEE Main. But as our motive is not only to crack JEE Mains but to crack JEE Advanced also. Therefor i will suggest you the following books to go for Chemistry :
1.For Physical Chemistry go for R Mukherjee or Nairendra Awasthy
2. For Organic Chemistry go for Morrison and Boyd or Himanshu Pandey(Both are very good books)
3.For Inorganic go for JD LEE.
These are the most famous books but i will suggest you to go to a library, than read different books available there of Chemistry. Look for the book which will give you the best content and connects with you the best.