Dear aspirant

Hope you are asking about tommorow neet exam.

So if your date of birth is wrong on addhar card don't worry about that usually they will match the addhar number on card with neet admit card and name that's all. So you can use that.

Otherwise 10th & 12th class marksheet can also be used as your valid I'd proof to enter neet exam hall.so take 12th marksheet as safety if they didn't allow on your addhar card.

As of now give your exam tommorow and after that visit addhar center and make the date of birth correction in addhar card by uploading 10th/12th marksheet or certificate or birth certificate as proof of documents. Usually it get corrected in a week time after you apply for that and you can download your updated addhar card. It's necessary to have same data on all your documents so don't forget to do that.

So be calm & don't worry much about such things and carry your 12th marksheet.

All the best for tommorow & give your best !!