How do I cover points missed by NCERT chemistry for the JEE Mains?
You can use other books to study the concepts in detail. For organic part you can use MS Chauhan and for physical chemistry you can use N Avasthi. One thing you have to understand is that no book is fully complete. In one book you will find some chapters that are written well and some are not that much good. For that you can take help from JEE mentors and talk with JEE toppers. They will guide you in a proper way by suggesting the books that are important. And you can take an idea that which chapter of which book is good. You can join a good coaching institute and follow their study materials which will also help you.