HELLO,

1. Go to the official AP PGCET website

2. Choose AP PGCET from the list of CETS

3. Look for a link like:-

• Forgot Registration Number or
• Know your registration Number

4. Enter detail like:-

• Registered Mobile Number
• Date of earth
• Name/SSC Hall ticket number

Your regeistration number will be displayed or sent to your mobile number

Also advisable to check your messages as after application submission a message is sent where your registration number may be available

Hope that Helps!