Hello STudent

As your teacher has missed to register your roll number in the register book then you have been appear for the rest of the examination and got result in the final but not in the sessional. So it will be better for you to appear for the both of the examination sessional and final to get better result and to get the the school record good. Because if there is any spot in your School result record when  there will be a problem whenever you will  appear for the class 10 examination /examination. So apoear for the both of the examinations sessional and final.

Hope for the best.