Big confusion

As you have already learned the concepts from these books. Now focus on presentation of answers (language, format) from ICAI practice manual, RTP, MTP, etc.

PM is basically for two things, 

1. Practice purpose 

2. Writing skills and way of presenting answers in exams

Now dont get confused too much and increase no of books in your study material, 

And for audit when you had studied from one book, you just need to understand the writing skills and presentation ways by using PM