Dear Peter,
How's it going?I'm sorry to hear that you have failed in the exams.Well,this is because you play computer games very often and even fall in love with them.Therefore,I really want to give you some suggestions.As you know,the computer games are very interesting and wonderful.But sometimes,I think you shouldn't play them all the time,because you see,it's bad for your eyes.So you'd better have a good rest and then play them for a short time.In this way,I'm sure that you can have good grades in the exams and relax yourself at the same time.
Yours
Tom