Thanks for your letter.I'm sorry to hear that.You said that yourself sad in the new school and everything was stange for you in the school.What's more,you failed in the exam last week.Please don't worry,I think you should make friends.With your classmate and talk to them.You can also listen to music and take pait in group activities to relax yourself.Work hard and you will come up with your classmate.If you have trouble,you can turn to your teacher or your classmate.I hope I can help you say.
I hope you everything goes well.
Best wish for you.