Hello,

Registration number can be hall ticket number/roll number/admission number of class 12th which will be allotted to you. You need to enter any of the above mentioned number which is applicable in your case. If you haven't received your hall ticket number yet you may enter your roll number or admission which serves as identification and it can be used to retrieve your class 12th details such as you name, parents name, date of birth, marks score, school/college name, name of the board etc.