Hello Dear,

The Entrance exam seat  number in the MHCET registration form is nothing but your Roll number that is mentioned on your hall-ticket.

Also, don't get confused between the registration number and the Roll number on your hall-ticket, they both are different. Registration Number is the number that is provided while filling the application forms. So that you can know you have successfully filled the application form. Roll number is the number provided as exam center and your seat in exam. It can be accessed only by entering the registration number.

Good Luck