SFM old syllabus

Mr Rajesh as my suggestion is ICAI SM/PM is more than sufficient apart from tat follow the RTP/Suggested answer thoroughly u will succeed

ADDITIONAL U CAN USE AADHITYA JAIN SIR CLASSES & BOOKS 

pm+rtp+mtp of last five years are enough for sfm

First and foremost you need conceptual clarity... without that no matter how many problems you work out..if there is a new adjustment, you'll end up messing up the entire problem.
I suggest you get AN Sridhar's book and read the the important concepts thoroughly...and then proceed to solve the problems.

If you find the same problem treated differently in institute pm...then stick to what is given in pm.