Hello, Tom ! I have heard about your trouble. It is common that boys at your age fall in love with a girl. I think you needn't get so worried . You should consider her as a best friend and get along well with her just like others. Don't be nervous before her ,which will affect your study. You can talk with her about anything as usual ,which will help you to improve your study. Treat her as others and try to do better in order to make a good impression on her and she will like you in the future. When you are older ,she will still think of you. Try to follow my advice and you can feel better.
Yours.
Zhixin sister.