Is there anyone like me?

Studied the whole year till nov-dec not that much but still I used to study. After that idk what happened I just couldn't study. All the board exams I have given on the basis of what I studied 4-5 months ago. Idk why in the most important exams of my life I just couldn't bring myself to study. In last days everyone was grinding i also tried hardest to study but just couldn't study.