If a person feels tired when studying, do you still need to continue studying? Is this time efficient? How to correctly maintain the high vitality of the brain?

If you feel tired, forcing yourself to study at this time will only be counterproductive and waste time. At this time, you can choose to stop and relax your head. Take a walk outside, look up at the distance, and do some other interesting things to relax yourself. You can take notes and do something you don't have to think about for the time being, that is, you have used your time and completed what you should do.