AMA - Padhuka plus Study Material and Practice Manual (P C tulsian (BEST but lengthy) is also good for Concepts it gives you easy steps to solve ques in exam).
ISCA - Manish Valechha ISCA - Memory Based Edn. and Practice Manual (The book is very Self Explanatory , all answers are given in easy to grasp manner. covers a lot of examples, diagrams, memory codes....No need to refer study material) use with practice manual only. (BEST)
Direct Taxes- T.N.Manoharan Plus Summary Module of Vinod Gupta (Prepare notes for lengthy and typical portion, if possible)
Indirect Taxes - Mohd Rafi (BEST) for Concepts (Padhuka/banger for detailed Study and past exam questions)