Dear Tom,
I have received your letter about your confusion before the High School Entrance Examination.I know ho you feel,but trust me,if you do as what I say,you will be better soon.
First,you should try to relax yourself.Such as listen to some music or do some sports.It can not only make you calm but also enable you to become more healthy.Then,sleep early and get up early everyday,make sure you schedule is regular.Last but not least,be happy and confident about yourself.I believe you can get a approving mark!
Yours,
Mrs Li