hello there
there are some steps you can take if you have lost your registration number .first try looking in you email inbox .if you don't find it there then check the spam messages section but i hope you will get you registration no. from the email itself you can visit the provided site to know more
https://www.careers360.com/exams/ap-eamcet
you can also contact through student's helpline portal provided on the official website
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