Need - idt-important topics

it is difficult to say importent topic for IDT

but if u observe then the paper is managble as have following score

case study :- approx 20 marks (most IMP)

practical ques:- approx 20 marks ( first ques) ( topic:- ssi , service tax on particular service , excise refer complier of banger , vat sett off )

Theory  of custom excise service tax  approx 20 marks on improtant issue and refer past paper to see trend