SFM QUERY

I would recommend:

1. Practice once from your respective teachers material and mark important questions from it. (Don't waste time on worrying about different books and which one is better) - All are same.
2. Do only unique questions from PM. Practice all of them by hand.
3. Do Attempt at least 3 Mock test papers. - Most Important
4. On exam day - Just go through important questions and all formulas. Don't try to practice any of those. 

Exam of SFM was easiest in NOV2017 attempt. So it is important to refer atleast two books. must practice PM.