Central Board Of Secondary Education [CBSE] — False Marksheet Class 10

Address:

Shiksha Kendra, 2, Community Centre, Preet Vihar, Delhi - 110092

My school has not taken any test, weekly or monthly test, pre- board, etc. in my session of class 10.
But my school has just provided me 51% in board examination 2020-21. When I asked the school faculty about this, then they told me that they don't know anything about this result. They told me that CBSE has provided the marksheet. But I didn't understand that how could a school provide marks without taking any exams or without knowing about the capability of the student.