I’ve found Ali Abdaal’s videos on You Tube are very informative. They include the research and as his a Doctor of Medicine he knows his stuff.
He highly recommends Active Recall by turning everything into questions and then Spaced Repetitions. Check out his videos for more information.
The other ways are:
Roman room method
Get to know the best way you learn - visual/audio/kinaesthetic and go from there.
I look forward to seeing your outstanding results in the summer.
Ps I will be taking more qualifications next year, Im just not sure which level - A levels or a degree.