Roman room method
Colour - use of in notes
Teaching someone else
There's lots on You Tube.
As a side note the brain has two memories (short term, and long term). The short term can only retain 5-9 bits of information before it shoves something into the forget bucket, so it's best to learn in small 5-7 bits at a time. Study for 20 minutes then take a 5 minute break doing an activity like juggling, dance or making a cuppa. Go over your notes 5 minutes after class, then 1 hour, 1 day, 1 week, 1 month and 6 months to get it into your long term memory.
Try to associate the information with what you already know. Study in area like the exam situation. The use of certain smells or tastes can also help.