Train your brain to remember things!
use the 20 minutes spaced interval approach instead of trying to cram everything in one go!

The general nature of forgetting information goes like this:
One day after the lecture, if you've done nothing with the material, you'll have lost between 50 and 80 percent of it from your memory.
By day seven, that erodes to about 10 percent retained, and by day 30, the information is virtually gone (only 2-3 percent retained)

Basically, Revisit and reprocess the same material, but in a very specific pattern