Do you want to have a happy life? Here are some suggestions for you.
Firstly, if you want to keep fit, you should have a balanced diet. For example, you can eat more vegetables and fruits. Don't eat too much meat or junk food,because they can make you fatter and fatter.
Secondly, don't stay up late, for you need tohave enough sleep. Before going to bed, you can drink a glass of warm milk, so that you can fall asleep more easily. Also, I suggest you do some sports every day, such as running and playing basketball.
Thirdly, when you have any problems, you can go to your teachers or your classmtes for help. Don't be afraid of failing. Failure is the mother of success.
Come on!I hope you can have a happy life.