If you want to retrieve your SSLC registration number for 2022 you can try to contact your school  like reach out to your 10th grade School directly and you can enquire the school administration for your registration number. They may have records for that or check your previous marksheets or any other academic documents. It might have your registration number all you can contact the State Board of Education. tHEY might be able to provide you the registration number or they might be able to assist you in that process.