I guess because of fairly generous study leave, we have much fewer school days left than that (assuming you are not counting actual exams).
We only have 25 school days left, I think, and because DS is doing art, two of those are fully taken up with the art exam (so he won't go to his other subjects those days, I assume). So really 23 of regular classes. If you counted the days he has to go in for actual exams in May/June and for his oral then it would be more.