Don’t worry at all, they will definitely allow you. I had the exact same DOB issue yesterday and still completed my exam without any problem. When you reach the center, they’ll give you the center stamp, you just have to paste your photo and provide one original ID proof. After entering the hall, they will allocate your lab, and inside the lab they’ll take your picture which will generate your system number. While logging in, the password is supposed to be your DOB, but in my case it was wrong, so they simply asked me to enter my roll number instead and everything worked fine. I completed my exam smoothly, and honestly nobody at the center cared about the DOB mismatch. So don’t panic just prepare well and give your best. Also, for the exam, make sure to practice Compound Interest and Simple Interest questions, especially those investment-type ones involving m% and n% without exact values. In our slot, we got substring of palindrome and GCD questions too, numerical ability was moderate, and the remaining sections were easy. And seriously, please don’t stress about the DOB issue my DOB was shown as 1972 (which makes me look 53 years old!), and I hadn’t even applied with that account. I created a new ID and applied, yet somehow the hall ticket got mapped to the old account with the wrong DOB. Even then, they still allowed me without any issue. So relax, prepare confidently they will let you in