Hi Manohar,
You must have received a confirmation email after completing the registration process which must have been sent by the TS EAMCET team. Kindly refer to that, you will get your registration number.
Now if you even don't have the mail or message do contact EAMCET help desk about your problem via mail. They will help you out.
Hope this helps :)
Do reach out to us for further concerns.
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