During Deadly Hallows events, students still went to Hogwarts. But, I can imagine, the entire curriculum could be replaced, even in terms of ethics, where students were learning DA instead of DADA.
As such, after the fall of Voldemort, was this year deemed as invalid from ethics/study curriculum perspective? Did the students have to do the year over?
I am asking this since I find it hard to believe Ministry and others would find this year as appropriate in terms of learning.