Plz help me on idt

You can refer Bangar for IDT.

Please try to prepare your own notes it will be very useful.

I wud say, study from Institute's books. They are more easy to understand. For Practical questions, prefer practise manual... If you are preparing self notes, then, also keep it updating with the latest amendments...

I refered institute's study material and N. S. Govindhan for IDT (Final)