Hello Vishwas
Do not panic. Situations like these are not uncommon in entrance exams that are held in such a large scale. You can tell the officials at the time of document verification about the problem but take some DOB proof with you (like your 12th or 10th marksheet etc). As far as I know the DOB does not help you to get a seat based on any quotas so as long as you are not too young ,below 17 (according to the eligibility criteria of KCET) there will be no problem as such since there is no maximum age for applying.
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