Has anyone used only Open tutition material to sit exams?

Hi All,

I’m wondering has anybody just used the material from Open tutition to sit exams without getting any other book.
I’ve sat 9 exams through home study and am doing P1 and P3 next and was wondering if I can just use the material for P3 (I have a book for P1) I was going to buy a book for P3 but if I fail I’ll have to get a new book as the syllabus is changing next year..

Can anybody give me any tips.. or should I just buy the book??

Thanks