CA FINAL - COACHING REQUIRED OR NOT?

Hi,

I just wanted to know if coaching for CA Final is really required because so far I have passed CPT, IPCC by self-study. To be really honest I have understood most topics on my own while there are some topics that I have not understood at all because of self-study. Please advice.

Also what are the best books one should refer for CA Final Self-study?

Mohit