Ipcc coaching and books

Hello,

I am currently attending coaching classes for IPCC May 2013.  I am with Prime Vision classes in Borivali in Mumbai.

My query is do I have to refer to books outside the ones that I received in coaching or the materials given in the coaching are enough?  This is my first time in coaching so I am a complete newbie to this.  

Kindly share your valuable opinions regarding the matter.

Thanks.