Dear you got notes made by Arsala for NOA academy? They are just fine. But don't just rely on notes. Secondly Sherbano's book is good for basic concepts. If you look at the list of books recommended by FPSC, not even a single book of local author is suggested. So please try to get any other book.
If you want to secure good marks then go for some other book. For average marks you can rely on Sherbano