Dear Vinay, if there is an option of appearing for betterment exams, you can opt for that. You can reappear for the subjects that you have scored less and can increase your aggregate. The other option is to opt for reevaluation. In this, you pay a certain fees tot he University requesting them to re-evaluate your paper. If they find there is any chance you could have scored more, they will increase your marks and this will inturn increase your aggregate.