please tell me

please tell me whether sarvesh kumar verma is best book for QUANT otherwise mention others...
i m in third year of engg.
please tell best books for DI too.

check the folowing

check the folowing links

http://www.cat4mba.com/node/94

http://www.cat4mba.com/node/710

http://www.cat4mba.com/node/805

http://www.cat4mba.com/books-mathematics