Dear Mary,
I'm sorry to hear thatowing to the failure in the exam, you have lost confidence in study as well as yourself.To make matters worse, you are fed up with your study.I'm concernedabout you and your study and if I can ,I'll spare no effort to help you.Here is my advice for you.
In the first place, I admit that good grades arebetter but good grades don't mean everything,which only show that you 've done well in the recent period. Therefore don't think too much of them. Relaxing yourself can also help and lessen your anxiety. Moreover,it's a good idea to communicate with your teacher with whose help you can easily find out the real reason for your failure, Last but not least,I strongly suggest you explore an effective studying approach ,which will do you much good.
In the end, I want you to remember--nothing is too difficult for a man who is willing to try.
Best wishes!
Yours
Li Hua