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