Hi Pallav

These are some of the best books

VA-RC:

1. For Vocabulary: Word Power Made Easy by Norman Lewis
2. For enhancing the reading speed, any novel and newspaper and anything you can read will be good enough.
3. For Grammar: Normal Grammar Rules from Wren and Martin.

LR-DI:

Books by Arun Sharma (TMH) and by Nishant Sinha (Pearson)

Quant:

1. Quantum CAT by Sarvesh K Verma
2. Quantitative Aptitude by Arun Sharma

Hope this helps