This is no surprise to anyone, but the most important thing for pretty anything in life (entirely in my own opinion), is getting enough sleep. Where studying is concerned, it allows you to better focus and consolidate new memories and data.

You should have a designated study area where you do all your studying and it should be as close as possible to matching a classroom or examination area, due to the phenomena known as a state dependent memory.

Take frequent breaks. Human attention is on average limited to about 20 minutes or so, so make use of the Pomodoro technique and take a 5 minute break every 20 minutes of studying and it will let you keep going all day.

Mnemonics are the techniques that involve combining new data with old memories and dramatic imagery and sensory input in order to rapidly remember and easily recall new information. Learn to use these and develop your own.

The brain and body are one; we are a single, monist organism. You can’t have a healthy brain if you have a terribly unhealthy body. Follow your doctor’s recommendations on dialing in the diet that’s best for your body and brain health, and then stick to it.