Dear candidate,

You will get the id at the time when you applyed. But no need to worry You can contact the people who deal with is on phone. Call them on 799564592 or 7995845619 or 8688896062 or 8688889464. Also, you can drop them a mail at convenerapeamcet2019@gmail.com, and they will get back to you with a solution. 

For more queries go through the link below-

https://apeamcet.nic.in/ContactUs.aspx

Hope I answer your question and it's helpful.

All the best!