Ca final group 2 books

Krishna Priya (FINAL) (158 Points)

07 August 2017  

Pls help me. I have costing  (padhukas) & ISCA(Manish velacha) books  which i bought last year.  and DT book which i bought this March. Do i have to buy again for this Nov attempt? Which books is best fro IDT & DT?

Thanks in advance.