Hello,

You didn't mention the examination name dear. But I think you got 71 in mathematics your 12th CBSE result. Because this result was out yesterday. You got 71 which is not bad. But if you are not satisfied with number then you can apply for the "optional examination". Which is an option by CBSE board. Like if any student not satisfied with there number in main subjects then they are apply for this "optional examination". This examination held on between 15th August 2021 to 15th September 2021. Because of the pandemic the CBSE 12th board examination cancelled and every students got passed the examination via their 11th class result and test result.  Now decision is totally yours, you think once again and talk to with your parents then you can go for any examination. Otherwise if your marks like total marks is good then I'll suggest no need to give this examination. Just focus on your upcoming entrance examination which is depend on your college admission.

All the best.