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What are the best books for both IIT JEE Mains & Advanced?
Thanks for those suggestions. Are there any other books that you would recommend?
Sure, here are a few more: 
- Advanced Problems in Mathematics by Vikas Gupta and Pankaj Joshi
- Problems Plus in IIT Mathematics by A. Das Gupta
- Chemistry for JEE Main and Advanced by Ranjeet Shahi
- Arihant's Comprehensive Handbook of Physics
- A Textbook of Organic Chemistry for JEE Main and Advanced by Dr. R.K. Gupta