To help revision, we recommend that when you use these resources, you do something with the information. Retrieval practice has been shown to improve long-term retention of information.
You could:
summarise with bullet points
write questions to test yourself with later (e.g. on flashcards)
Write a summary at the end
Write your own exam questions (with a mark scheme) based on the topic.
You may then go back through the resource checking what you recalled. correcting any errors and adding any omissions.