Revision strategies? (History and economics mainly)

I’ve got mocks in 19 days, and honestly, I’ve done almost no revision so far, mainly because I’m not sure how to approach it. For maths, I know it’s all about practice—just doing problems over and over—but I’m struggling with how to revise effectively for history and economics.

For history, I know I need to work on past papers, but I’m unsure of the best way to review the content itself. Flashcards feel too tedious, and notes don’t seem to stick in my memory. It’s a similar story with economics—I just don’t know the best method to make the material sink in.

If anyone has advice on what works for them, I’d really appreciate it. I want to use this strategy not just for these mocks but as part of my long-term revision plan all the way to A-levels