Do a lot of 'active recall'- you can search it up on YouTube.
Also do a lot of 'blurting'. Get a topic and write everything you know about it, in a 10 minute timer (for example). Then after 10 mins, check your textbooks and see which information you missed out- write this in a different-coloured pen. Then understand the reason why you missed out those info for example: maybe you only read it once before, you didn't create enough visual diagrams in your head, you didn't understand it. Then find ways in solving this problem. Repeat this 2 days after and see if you had more things written. This obviously doesn't work for maths but does for science (for example). As someone stated above, past papers would be good for maths.
Active recall and blurting are the best way to remember AO1. To do the AO2 and AO3 questions, past papers would be the way to do it, as well as the textbook questions.
And with regards to "websites": I don't think it matters. You should develop the skill of finding any random (potentially useless) website and still be able to get all your information from it. Try develop this skill. But it is subject-specific though.