Answer. It is not definite. Be it any exam/subject improvement you cannot be guaranteed for marks increase. If you are well prepared and confident about your preparation then you should choose for improvement.
Does marks increase after rechecking?
There is no limit to how many marks may be increase after Re-evaluation of answer sheets. However, in majority of cases the marks remain unchanged, and there is only a rare chance of your marks getting decreased.
Does rechecking reduce marks?
This means that marks will not decrease after a reevaluation, but can in the case of verification of marks. In the case of verification of marks, fees paid by the student will also be refunded, if it is observed that there is change in the marks.