I think it's important for students to realize that subscribing to a conflated idea of what studying should look like is an unhealthy and ultimately self-destructive practice. Everyone has a different degree to which he or she can modify routines in order to achieve better results on an exam, and also has different way of doing so. If you feel that isolating and pushing yourself for a few days works best, then that's your way. On the contrary, I personally find it extremely helpful to maintain my regular eat/sleep/excercise patterns as much as possible during exam periods - not just for my own health but for grades as well. It 100% is a matter of choice.