The failure of junior high school mathematics unified examination may be caused by many reasons, such as weak basic knowledge, improper learning methods and lack of practice. Here are some ways to deal with it:

1. Find out the problem: First of all, analyze why you can't get the exam, because you don't master the knowledge points well, or because the thinking of solving problems is incorrect, and so on. Only when problems are found can targeted improvements be made.

2. Strengthen basic knowledge learning: If you find that your basic knowledge is weak, you need to spend more time studying and consolidating. You can improve your basic level by reading textbooks, doing exercises and consulting teachers.

3. Change learning methods: Some students may be used to rote learning, and they may be able to cope in junior high school, but it will become more and more difficult in senior high school. Therefore, it is necessary to change learning methods and pay attention to understanding and application.

4. Do more exercises: Mathematics is a subject that needs constant practice. Only through a lot of practice can we really master the knowledge points and problem-solving skills. You can do more simulated test questions or real questions over the years, so that you can better understand your weak links and make adjustments in time.

5. Ask for help: If you can't solve the problem, you can ask your teacher or classmates for help. Teachers will give corresponding suggestions and guidance according to their own situation, and students can also exchange experiences and skills with each other.

In a word, it takes enough effort and time to get good grades in junior high school mathematics. As long as you keep studying and practicing, I believe you can make progress.