first of all i dnt buy that idea for going for any one group , the reasons are very simple u might clear the first group then when u go for the second group u need 200 and in that case u need to be master in atleast one subject to score atleat 60 in one subject , so i will suggest to go for both the groups .
now when u comes for books first take the assessment which way u like to read few people have habbit of question ans answer format few go for plain reading .
so i can tell u the books i like :-
1. account :- mp vijay kumar and d s rawat for standards
2. sfm :- s d bala and study material
3. audit :- paduka best of all
4. claw :- no option simply take munish bhandari main book and even hand book
5. costing :- ravi kishor /s*xena and vasisit look for the study material u find 40 marks paper as cut past from study material , its very imp as costing paper is very lengty so u need to know the problem so it will not take much time in exam to solve
6. isca :- no other option dnt even dare to touch any book rather than study material
7. dt :- vinod gupta / tn manoharan
8. idt :- dattey if u like to read in details / question answer format banger
here no one will tell u but read the study material bcause each and every provision is having conflicted decision , but institute material take one stand about each particular cases so its better to look at what institute stand regarding the same
then in final time practical manual , rtp of past two year
4 time reading of each subject is must if u can do that no one can stop u from getting pass in ca final