For IDT strictly from an examination point of view follow this approach-
1)common topics-bangar book
2)amendments and case laws
3)numerical problems from module and PM
4)Foreign trade policy-expected weightage around 8 marks
The weightage of above 60 to 70 marks
After completing the above do the remaining aspects which includes ST EXCISE AND CUSTOMS
REMEMBER-You can do this only after u have completed ur first reading
For DT i need ur suggestion.....pls help me.