If you have finished the NCERT standard books for Chemistry (Class 11 and 12) and your basics are clear, you can refer to these two books to improve your Organic Chemistry for IIT JEE (JEE Advanced):
- Organic Chemistry – Morrison Boyd
- Organic Chemistry – O.P Tandon
These books will help you have an in-depth understanding of all the concepts in the syllabus of JEE Advanced. Also, there areJEE Advanced Chemistry practice questions of advanced level in these books. However, I would recommend you refer to these books only to master the most important chapters of JEE Advanced Organic Chemistry.
Regards
Arun