Hi Shruti,
I understand that you are not able to view download admit card of some examination of institution due to some mistake in your date of birth which probably you have entered in correctly while applying for the same and so to answer your question you need to first check the availability of any correction window for making the necessary correction and if there is any available then you to make the subsequent correction. if there is no provision of a correction window then you to address this matter to the competent authorities through post while clearly stating your details and your error while filling up your application form and earnestly request them to make the necessary condition in your application form so as to retain your successful candidates and also so that you are able to download the admit card properly at the earliest.
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