for IPCC refer the below stated books 1.Law- My experience with Munish Bhandari's book was fantastic.I am sorry to say this but i found the institute's module of law very confusing.So i did not refer to it after a few initial chapters.Munish Bhandari book has got all solutions of previous years' questions in a very good manner and the presentation is also perfect.But stick to institute's module for Ethics portion.
2.Information Technology and Strategic Management- I referred only Institute's material. Just looking at the scanner you will be able to judge that all the questions are directly from the institute's book and so its better to refer it.All other books are nothing but a copy paste of institute's module.
3.Auditing- Institute's material is too vast and for students who are going for both groups in 1st attempt,its not advisable to go for it.Everything is given in a very detailed manner, Not condusive for exams.I opted for Surbhi Bansal's book along with DS Rawat for SAs.
4.CAFM- Institute's material along with scanner is a must for success.If you get time then go for other reference material.Paduka is good or else look for some assignments from teachers.
5. Taxation- For indirect tax only institute's material is advisable.Learn it word by word coz its easy and carry 50 marks.For Direct Tax go for either Girish Ahuja or VK Singhania.Better prepare notes for easy reference.
6.Accounts- Varies from student to student.I would suggest you to solve institute's material and scanner 1st and then look for any kind of reference material.Tulsiyan's book is good ,i referred it for a few chapters.