Coaching materials are good for practice as well as revising. But you never should follow them in order to build concepts. Coaching materials can only be used as proper book if and only if you are following that book after the classes conducted at your coaching center. But if you are buying just the coaching materials then use it for practice and build your concepts from the other traditional books.

To know about JEE Advanced recommended books visit the link below:

https://engineering.careers360.com/articles/best-books-for-jee-advanced

To know about the JEE MAINS recommended books visit the link below:

https://engineering.careers360.com/articles/best-books-for-jee-main

I hope this answer helps. All the very best for your future endeavors!