Suggetion reqd

hii............. frnds evry1 says dat it is easy to get xmption in DT & IDT paper but i found  DT quite difficult.........so pls if ne1 can sggst how to prepare for DT or what topic to b covered 2 get 50 marks ???........nd onethin more how much marks does recent case law nd amndmnts covers apprxmtly specially in nov attempt as i heared dat icai used 2 ask amndmnt related questn less in may as cmpr 2 nov??