Direct tax laws

Hi, I have direct tax Padhuka book pertaing to last assessment year. Is it enough if i buy supplementary book for DT issued by institute or i have to buy new book?

Can i change the book?

Suggest - Vinod gupta or Padhuka - which is best ?

And also - AMA - Is it enough if i buy practice manual & compilation because i dont want to refer any other book as the time is too short for May exam.