I have suggested it for accounting. As I said, although the book has some shortcomings, it does cover the whole syllabus for Accounting (P1 and P2) as it’s written specifically for CSS.

My point is that this single book is enough for a decent attempt. However, to get solid marks in Accounting you will have to follow different books for each section since the different sections in the syllabus are completely unrelated to each other.

I hope I have made myself clear.

Furthermore, I think you can use WT books for other optional subjects as well to develop a basic understanding of a subject. However, you must go the extra mile and study at least 1 other book for each subject. Remember that any book that is not written specifically for CSS is unlikely to cover the complete syllabus for a subject. Candidates nowadays also prefer using the internet to search topics and make notes.