Hello Simone

 

Research has shown that the brain's optimum focus time is between 1-1.5 hours and any concentration after this becomes more laboured as time progresses. 

 

This doesn't mean you should only study for short bursts, it means you should walk away from your books for a few minutes, clear the mind, have a drink or breath of fresh air and then return.  By moving away regularly to refocus, you are ensuring your brain and learning capacity are always working at optimum levels.

 

Another tip is to drink plenty of water when you are studying.  A fully hydrated brain absorbs faster and learns more.