wintry reef
Top students who want to get great grades usually need 5 things:
1 read the course book and solve it's exercises
2 make or get a core content book (or notes) that is intended to be memorized it's usually less than 150 pages.
3 finish the work book
4 solve past papers
5 read the grading manual to better understand what is required of your answers
Unfortunately, one of these is still missing. Am talking about the core content book which is intended for memorization purposes. And the only way to get this type of resources is to either hire a private tutor or simply go to school as they have it prepared by the teachers but sadly not all of us have access to such facilities, as many are studying alone and thus end up finding themselves either relying on notes that they have to double check or worse waste time writing their own notes.
A solution to this is to restructure the people who write notes in a way that they could collaborate to write quality books/pdf by working together and rechecking each other's work instead of just publishing notes that might go unchecked.