Got only 73 percent in tbse boards 😭

I never got below 80 percent in my life. Even in preboards I got 87 percent but how comes I got only 73 percent. The paper were check unfairly. Most of the students got very less marks than expected. But I was damm sure that I will get 90 above and at least 80 minimum even after cutting marks due to handwriting but still got very less than expected. I feel like all those hardwork were useless. 😭