Awesome tip I live by in exams: Never give up regardless of circumstances!
So currently, you think your performance in mathematical tests aren't that brilliant. Perhaps that is true. However, that shouldn't give you the excuse to give up. Remember, we still as year 10ers, have our half year exams and I'm sure most of the weighting comes from this. Don't feel bad about your performance right now. As people and I'm sure most others would agree, mathematics takes time to master. It requires understanding the topics and consolidating your work through exercises. Try to gain an interest in the area if possible rather then simply appear as a rote learner. Are you struggling with mathematics at school? Perhaps you could talk with your teacher about how you made your mistakes in those past tests and learn not to make them again. Have you considered getting a tutor if necessary for you? Remember, you're responsible for the performance of your exams and nobody else. I have faith you can work hard and get an A in your mathematics report this year. Perseverance is key.