There is no certainty that classes will take place. In Moscow there is very little food, and even fewer apartments for the studying youth. The civil war is approaching, perhaps, in its most beastly form, in the form of the defeat of soldiers who are running from the front in hordes. See more
Above that, Bolshevik students want to sabotage the school year, in order to free their agitators, and would only magnanimously allow to hold state exams.
We begin every year thinking that it can't get worse. And then it gets worse.