To find your Class 12th registration number , you should first check your admit card or hall ticket issued at the time of board exams, as it usually contains the registration number along with other details like roll number and exam center. If you do not have the admit card, you can also check your school records , as schools maintain a copy of all students’ registration details submitted to the board. Additionally, some state education boards provide online portals where students can log in using personal details (like date of birth, name, and school) to retrieve their registration number. This number is important for checking results, downloading mark sheets, and other official processes.