If you have forgot your PGCET user ID then I would recommend you to check your email ID or the registered Mobile number as during the registration you must have received a message from there side, where you will get the USER ID.

Now if you get the USER ID then visit the PGCET website and click on the forgot password and you can retrieve your account.

To know more about PGCET visit the link below:

https://engineering.careers360.com/articles/karnataka-pgcet

I hope this answer helps. All the very best for your future endeavors!