Financial Accounting
I used CA books for this portion in my first attempt.
This time I used the book by Sohail Afzal which is what I would recommend you to do as well.

Cost accounting
Sohail Afzal’s book. Really good.

Auditing
I think I used the book by Saeed Nisar. Use any book, all are same. Just make notes.

Finance
Van Horne
Ross

Business
Some local author. Very basic concepts. Again, use any book to make notes.

Tax
Moazzam. Numerical questions are tricky often.

In addition to all these books, I used the book by JWT.

If you do not have any background in accounting, this subject is not recommended.

If you still want to go ahead, choose only if you have:
i) ample time e.g you are going for 2021 attempt
ii) some guidance/teacher

Practice is key. Good luck.