hello,

Give your final mark which is given by your college/institution board. don't fill anything wrong. if it is found out later, your application form will get rejected.  if you are having doubt then read the form filling guide of CAT and then fill it. They might have written how to fill for different scenarios.

Do check your form prior submitting and confirm it multiple times. don't do any mistake as making a correction is not easy after submission.

Hope it helps!