Taking a structured approach to note-taking is the best way. Put the outline notes by choosing four or five key points of the lecture, followed by in-depth sub-points. One way to review is to use the Cornell Method, which divides the note sheet into three sections:

• Cues: It includes key questions and main points.
• Notes: Which you write during the class using the outline method. 
• Summary: Which you can write after class while reviewing.

The mind map is a visual diagram of abstract concepts.

It works best in subjects like chemistry, history and philosophy, subjects having a neural network like interlocked and complex topics. 

“Work involving higher mental functions, such as analysis and synthesis, needs to be spaced out to allow new neural connections to solidify. New learning drives out old learning when insufficient time intervenes.”

A recent theory on forgetting states that everything we learn remains in storage inside our memory, but our ability to recall and retrieve that information fades if we do not practice fetching information.

It is imperative to sleep 7 to 9 hours for most adults.

An alarm clock or phone alarm can interfere with the body's sleep cycle to wake us up before a cycle is completed. It is healthier to sleep while not being simulated and wake up naturally.

Apart from rest, it is crucial to have a daily exercise routine and get some sun exposure regularly.

Human beings are designed to move and be in the sun, trekking and toiling for hours. If you are feeling tired, walking outside in nature and getting some sun will help.