Previously in several episodes I mentioned my method I used to memorize some random information. I did not use it to memorize text books, maybe you can try. But I used it to learn English on my own. I had to memorize lots and lots of words. I used it to study Latin when I was at the university. I learned shorthand. Yes I was writing all my lectures 25-30 years ago using shorthand. And you know what, I can still write, even though I got a bit rusty since I haven’t used it for several decades.
