Sfm prepration???

"Practise makes a man Perfect" the same things applies on papers lke SFM. You've to first understand the concept and then thoroughly go through practcal solutions. Because no one can get better understanding of practical problems untill he has the knowledge of theory. So prepare well and best of luck.

As per the current trend of SFM papers, one thing is confirmed that u need have a good grip over last 5yrs suggested answers, RTPs and Mock Test Papers. 

Apart from this do not switch over to any other book and continue with S.D. Bala.

Mr. Umesh has rightly said that SFM requires a good amount of practice. So u need to put effort on the practice part by conceptually understanding each adjustment.

U can refer A.N. Sridhar which contains sufficient sums to practice for exam...Good Luck