Take notes by chunking and consolidating information.
Students who take Cornell style notes do not realized the importance of consolidation: it helps them to understand and practice how the brain works best. There's no need to review your book again—you can just review your 'consolidated notes'!
Why are Cornell style of notes important?
It helps you practice how to learn—putting information in chunks, helping your working memory, which has limited storage capacity. Working memory is like a computer's RAM. It is fast but has low storage capacity. Scientists believe you can put at most 'seven' units of information, though only three or four units is best. Think of it like having three or four storage shelfs.
Consolidation helps you deal with your working memory.
Clump similar things into one spot or shelf. Write things down and classify them. Classification helps with understanding and memorize things. Two processes: encoding and retrieval, which many people don't focus on.
Retrieval requires practice.
It is similar to filing things in your cabinet, but then not remembering where it is. What you never did was practice retrieval. Quizzing is therefore absolutely essential, and students need to be experts at practicing retrieval: at quizzing. Teaching is also a retrieval practice.