How to study isca from module

I took coaching for may 2015/nov15 of isca from swapnil patni sir.

I managed scoring above 50 in 1st attempt but after that my scores are less and less.

Also some points not included in his book.

I shifted to icai study material and i prefer doing from it only.

Can anyone guid me how to do it as in may 2017 i did from it & scored too much less.

Please help me.