Hi dear,
            If you thinking that you can get good marks or improved marks after rechecking marks of your answers then you can proceed.Kindly read some details about Rechecking of a paper by CBSE board.

If you are applying for Re-Checking, your best marks out of the two will be considered.
For Example You got 75 marks in Computer paper and if you apply for rechecking and your marks increased to 80. Then the highest marks or the best marks ie 80 marks will be taken into consideration while providing your DMC by CBSE board.

Rechecking: Rechecking is verification of marks or Recounting of your marks from the very first page of your answer sheet booklet.Its check calculation mistakes only.
It also checks whether your all answers are reevaluated not checked or not.

All the best