1. If your child does well in the exam, you can write: xx, you are great. This is the result of your own efforts. Parents praise you. We should continue to work hard in the future and live up to the teacher's teaching.

If the child's grades are average, but better than last time, you can write: xx has made great progress in this exam. You must continue to work hard. I believe you will make greater progress.

3. If the child's exam is worse than last time, you can write some encouraging words: xx is not ideal in this exam, so you should continue to work hard to improve your grades and live up to the teacher's hard work.