Buy books for nov 2015

MADHU (ca final) (232 Points)

25 April 2015  

I'm writing my 1st group ca final this may. I want to start my preparation for final group 2 as soon as I finish my 1st group exams.

So I want to purchase books for DT & IDT applicable for nov. 

Prefer to read DT- vinod guptha summary & amendments, IDT- bangar both text book & compiler.

So can I buy the books directly available in market now ie books applicable for may 2015 or do I need to wait till new editions are released after may exams. (I'm not sure.. Do they really release new bboks for every attempt??)

PS: suggestions for other books are always welcome.

Thanks...