The equestria girls could be 11 grade and the three pictures could mean 10 9 and 8. But that would mean that school starts at 8th grade. At forgotten friendship they do yearbooks meaning the school year is over so they arent 12 grade
I havent seen any pony couterparts to most humans in eg but i could just not relize that they have it?
If human sunset goes to chs then does that mean pony sunset will hace to go back to equestria?