If you have not been able to understand the concepts then go for ISCA by manish vallecha it explains all detail with examples. this book very good for exam preparation.
Is it really difficult to study module ? bcoz i heard that marks can only be obtained by ICAI materail...isn't it sufficient that Dinesh madam sir buk is kept just for reference ?
IF you have studied from study material, you can easily select the best book for ISCA.
Go to the retailer read the portion where you have sound knowledge and select the book that you find perfect. In my view Manish Valechha ISCA book is much better.