Ooh, you had me at stationary!
My friends and I were talking about having specific techniques for each subject, and whether that’s helpful. We decided that essay subjects, like History and RS, suit flashcards the most. So, for example, I made one flashcard for each event in history; e.g. one for The Ohio Gang, one for The St. Valentine’s Day Massacre, etc.
Next, for science and maths subjects, we settled on practice papers. Firstly, look through notes and textbooks, and then test your knowledge on some specimen papers or some CGP practice books.
Then, for English, we chose Quizlets as the most helpful! Have one side of your flashcard as the first few words of a quote, and the other side as the full thing. For example, in Dr Jekyll and Mr Hyde, one side just has “Soho...” and then once you turn the flashcard over you’re met with the full quote of “Soho... with its muddy ways and its slatternly passengers.”.
Languages are definitely another one for the Quizlets. Although, this time, you’d be better off using some that are already on the website rather than creating your own.
Unfortunately there aren’t any more relevant subjects that I do, so I can’t give anymore advice on that front. But I really would recommend discussing with friends what they find the best use of their time is, for each subject!