Personal experience: Learn by doing. Practice. There's no shortcuts, afaik. Take your notes by hand ( paper & pen[cil], Cornell style is very nice. Typing does

Personal experience: Learn by doing. Practice. There's no shortcuts, afaik. Take your notes by hand ( paper & pen[cil], Cornell style is very nice. Typing does not work like handwriting ) study by night before having a full night's sleep. Let your shot-term memory be written to your long-term memory over the circadian cycle while sleeping.