Dear Smriti, your admit card will not be withheld because of an error in the application form. You will get the admit card and you can also appear for the exam. The only issue you might is face is during the counselingband admission phases. When you have to submit the original documents and they are verified, there might be an issue. But again if you are carrying your original documents as a proof and you can explain your error, you might have a chance.