I leave my phone home and go to the library with all my books, past papers, mark schemes, etc. I also don't have a library card so I can't log into the computers.
This way I can't check social media and my siblings aren't there screaming in my ear xD
Active recall (just from the book, not flashcards). It can get super monotonous, but helps in a pinch when you have no time to make notes and has served me well over the years .