Identify the knowledge/ topics are you want to cover.
You could use the course specification or Achieve to help with this.
Take a blank piece of paper/ whiteboard and write down everything you can remember about that topic (with no prompts).
Give yourself a time limit (e.g. 10 minutes)
Once complete and you cannot remember any more use a different colours to highlight/underline words in groups.
This categories/links information
Compare your brain dump to your notes/ course specification and check understanding.
Add any key information you have missed in a different colour.
Keep your brain dump safe and revisit it.
Next time you attemtp the same topic try and complete the same amuount of information a shorter periof of time or add more information