Discussion and solve more question increase your understanding and memorizing power.
The key is repetition. Keep going over it from time to time. Reading once and expecting to remember everything is expecting too much from your brain. Structure your learning and make time to go over what you’ve studied. And take breaks when you’re tired... That really helps.
Focus , repetition and mostly understand them . Do not get them by heart without understanding them because it would be waste of your time and your energy..
If u will be cram your knowledge say u bye bye) You must understand your theme and u remember this to long time.
Whenever you think about quit, remember that day why you started.and find a cause why you are doing this thing. If you have any reason you will never forget about that thing...
Continuous repetition. Even without ur note see how well u can remember without looking at the note