I just had an assembly in school about useful revision methods and such because we have our 2nd set of mocks when we come back. They talked about how highlighting and reading from a book is useless and ineffective but that's basically what I do. I recently found this method after my 1st mocks which were decent so I have no evidence that it works. I think it works well though. Imo most people try convince themselves that they're revising by making notes but then by the time they're done making all the notes, there's no time to practice.
What I do is find or get textbook PDFs of every subject (since textbooks teach and do basically everything with more details that revision guides (like how to answer, examples, etc.) and then find the specification/PLC for them. I only use textbooks and PDFs because most of my teachers are horrible so I have to teach myself things and because PDFs allow me to highlight, edit, add text etc on adobe acrobat. Anyways, I then look at the spec/PLC and highlight the things from there which is on the spec. This way, when I want to revise a topic, I go to the page and see the highlighted things, memorise them with my good memory and then quiz myself with the spec. After this, I do many exam questions provided by the textbooks and from online too. I think it's better as I can use what's already provided without having to make hundreds of notes and cards.
What do you think? Is this ineffective like the teachers say?