EDIT: wait a moment, now I'm confused: if her (Lena's?) marks weren't an issue for induction, why does it matter that her friend got jealous and ruined her test?
(or did I get this story right, but it wasn't necessarily a general all-Union thing, just that in this specific case a 2 would have been problematic for her troop/school/family?)
Straight "A" students did get some additional rewards, such as trips to summer camps in Crimea.