Whether to join classes for group 2

STUDY PLAN FOR CA FINAL GROUP 2

I have attempted my group 1 in the month of May 16, with a leave ofonly 40 days. Now I have entire around 5 months in Hand and have to prepare for group 2 along with if I fail in group 1 in the month of July then both groups.

Considering the subjects of DT, IDT & ISCA what should be the startaegy to atleast aim for 60 in each subject. Whether i should go in for self study or coaching, if self study then which books should i refer so as to clarify my concepts clearly .

Thanks in Advance......