[DanBC]

Read a paragraph. Close the book. Write down what you remember. Re-read the paragraph and check.

Once you've got the hang of this expand it to pages and then chapters.

Get someone else to test you a short time (a few minutes) after you've read the chapter. Get them to test you a couple of hours later. Get them to test you a day later.

Teach the concepts to someone else.

Implement them - learn by doing.

[e19293001]

It is often called the feynman technique wherein you pretend that you are explaining the topic to someone without looking at the text that you had read. Try googling about it for more information