Firstly, you should exercise. Doing exercise every day can help your body keep healthy. Secondly, having three good and healthy food is important,too. You shouldn't eat too much junk food. Thirdly, drink enough water and milk every day. Fourthly, you should get enough sleep. If you don't get enough sleep, you will feel tired and you won't concentrate better. Fifthly, you shouldn't drink, smoke and take drugs.