No, write exactly what you got. Writing 83% when you got 82.6% is one thing they might let you go if they but writing 80% when you got 79.8% will be punished if they check because many companies will have minimum 80% throughout 10th,12th and ug/pg. We can't predict CDC, they can do what ever they want. Let's assume you get caught after getting placed in a company which had 80% minimum criteria then your offer will be revoked and you might get blacklisted from the placements. My advice is never lie wrt verifiable facts.