A* notes doesn't mean you will get an A* by reading them - you get an A* from putting in the effort to make the notes which reinforces the material into your memory in a way that you understand it.
I'm sorry to say there are no shortcuts but i would recommend doing past papers and consulting textbook on topics you don't understand if want a quick solution to boost your grades. Textbooks give you a far better grasp of a topic than notes ever will - as you will find when you start university.