Hello Aspirant,

On the Maharashtra board exam mark sheet, on the top below or above  the candidate's name , there is a box named as "Seat No." , from what I have understood this is the equivalent of roll number , so you can enter that information. However, before entering , you may simply confirm the same with any of your teacher, school administrative member or a classmate.

https://competition.careers360.com/exams/ssc-cgl

https://competition.careers360.com/articles/ssc-cgl-books

All the best