To brush up on...

Meaning

To review or improve one's knowledge of something.

Examples

• John: I need to prepare for the presentation.
• Alice: Why don't you <b>brush up on</b> the key concepts?
• John: Good idea. I need to <b>brush up on</b> my presentation skills as well.
• Alice: Reviewing your notes will really help you <b>brush up on</b> the material.