One of the best classes I took in college was a "learn how to study class", I never had to study before college so I was woefully unprepared for engineering school. Probably the best thing I learned in the class was the Cornell Note Taking Method. I implemented the method the next semester of college and totally crushed it with limited studying, I probably should have continued using it but I was a knucklehead and didn't.
I glanced at it and it reminds me of my grandmother's system. She was born in 1918 and went to college in her mid-30s. Very bright.
Anyway, she took her lecture notes in shorthand. Shorthand is very fast, so she took down every word. She would go home and transcribe those by hand to regular English. Then she would type it out on her typewriter for a final copy.
She said by the time she did all that, she was done studying.