ca final IDT

Greetings all,
May i know how should i prepare IDT for CA final.... I have purchased Bangar's book and i have been studying it for past one week but I am not finding the subject interesting & so i was wondering is that the right way to prepare the subject....Therefore, I'll be grateful if anyone here can guide about the right way of studying & scoring well in the subject....
Regards..
Charnjeet