When you’re too tired, you are not very efficient, so continuing studying is a waste of time (the mind barely assimilates it).
The student has to respect sleeping times.
Sleeping hours (minimum 7, preferably 8) are “sacred”. You can’t sacrifice yourself thinking that you don’t need much sleep and that you can stay up and study more, because in the end, this will cost you.
The student starts getting tired, and intellectual performance is considerably reduced.
When you don’t have exams, you can use the weekends mostly to get some rest and do some leisure activities.
However, when you have exams, you need to find the strength to give up on these other more pleasurable activities, and focus on studies.
It’s only a few weekends a year, so this sacrifice is easy to make. You’ll soon get other Saturdays and Sundays to enjoy.
It’s good to do complementary activities (sports, languages, music or anything else), and not focus exclusively on studies.
This lets you disconnect and find other incentives, which helps your mind be “fresh” for when you have to work.
These activities should be complementary, so you have to do them with a certain level of relaxation, trying not to turn them into an obligation for the student.
These activities can be done both on weekends and during the week, as long as they’re not incompatible with the study plan. It’s just a matter of organization.
Lastly, we need to say that it’s good for the student to learn some relaxation exercises, something that can help him lose tension, especially during exams.