Hi Vijeth,
I would suggest the following books:
1. Costing: Your classes notes, if you have joined any. If not then refer Institute's Study Material.
2. ISCA- Jignesh Chheda's textbook is a good book to refer.
3. DT- Vinod Gupta, but Singhania is also good.
4. IDT- Bangar
And for all the subjects please refer practice manuals, RTP and last 3 attempts exam papers.