Health is very important to us. As a student we need to keep our body healthy because our final exam is just around the corner.It is very simple step. All you need to do are get enough sleep within six to ten hours in night, drink plenty of water,avoid stress by playing badminton or other sports,exercise regularly also can increase your metabolism that strengthen your body.http://www.ehow.com/how_2295402_maximize-bodys-immune-system.html