CFS in FR

you can refer to study material

or any help book or try coaching institute

not the study material please. It will take a lot of time to understand from it..

better buy MP Vijay Kumar book...

complete the whole chapter without leaving any sum....

and by heart the whole procedure of solving the sums it will be very useful

marks are allotted for each step 

so if you do all the steps as done in MPV book it will be easy to get marks even though you go wrong in between