Central Board Of Secondary Education [CBSE] — Complaint regarding 10th class board Mark's

Good morning
I am suraj gupta of 10th class student. I am good I'm study. I am not satisfied by my board Mark's because I am getting good Mark's in all classes I.e. 83%-85%. In 10th l am got 73.2%. Even I attend all online classes, full attendance, all written test in class. And also my preboad was good. In my class who cannot complete with me they getting 85%-89% this time. In preboard science and maths was very good but in result I got 61% and 66% . I want to take science stream in 11th class.
At last I am requesting to solve my this problem as soon as possible .

Thank you