Stressing out about end of semester

As the semester ends the increase in streess grows higher.  It now is coming to the day of having to study and figure out when do I study, what do I need to know, and projects due.  Last of all when do I find enough time to study.  The worst part is when you have been studying for hours, staying up till morning hours not sleeping, and then you get the test and you look at it and you do not remember anything at all.