A Level HelpWatch
If it works for you go ahead
It is. A lot of people find it useful for memorisation in the sciences but ymmv whether you personally find it useful. You've got to see what works for you, there aren't really any universally bad revision techniques.
I think the best way to revise for Physics is to attempt as many exam practice questions as you can. Flashcards are good for memorisation and recall of definitions/concepts and equations but not for problem solving.
Nothing should replace doing practice questions. You can pick any method you like for learning the content but testing/stretching your knowledge and practicing should always be done with questions. (you dont really know how well youve learnt it otherwise) Though save past papers until closer to the time.
Yes. You could also try question flashcards. I would recommend a question on one side and the answer on the other using the content info (e.g. notes and textbooks) and specification. I would also recommend using common questions and answers from the mark schemes of exam questions and past papers, to help you hit all the points required to get the mark schemes, with all the keywords and specific words required. You could also do important keywords and their definitions from mark schemes. Use mark schemes to identify key information and take notes. Test yourself until the answers stay in your head and highlighting and going over the ones you tend to keep forgetting until you memorise them. Organise questions per topic.