Everyone has their own way of revising, but I prefer rewriting the notes and then saying them out loud. Or if you could find online summarised notes, you could print, highlight and say them out loud too.
Others revise well through watching videos, just find a YouTube video on your topic.
Exam questions are also extremely important, and you can find them easily, or you could look through past papers online. When doing those, look at the content that you got wrong in the paper and revise it.