May I surrender the result of of 10+2 CBSE for improvement

Yes why not!? But,buddy your marks in +2 are nowhere important actually. But if you want to text appear you could apply for improvement exam to upgrade ur results.

Hello Ankit,
Every year CBSE conducts improvement exams for students that had appeared for class 12th examination the previous year. You can go for improvement exam in all the subjects or only the subjects of your choice.
As for your question about whether you should surrender the result, you should surrender the result only if you are confident that you will be able to improve your marks and have not been able to perform to your capability in the previous exam.

Hii Ankit,

CBSE and other boards consider the best of both the marks of improvement exam and regular exam. So you do not need to worry about it. If you will get the lesser marks in improvement exam then CBSE will consider your marks secured in the earlier exam and the mark sheet will be prepared on the basis of your earlier marks.

All the Best!!!

Hey, if you are worried that you will have to surrender your marks to write your improvement exam then you do not have to worry about it. If you get lesser marks in your improvement exam the one that's highest will be considered. So if you scored lesser than the marks you got the first time, the first marks will be printed. I hope this helped.

Best wishes