Reminders that Reiner has a military mindset and Cater simply does not! Different worlds, man. He lets the final magic orb disappear as one of his Split Cards wanders off to check on something else in the shop.

"Yeppers! An all-boys boarding school. I was nearly at the end of my third year. After that we go off to an internship before graduating."

So, the school portion of his academic career was nearly over, unless he decided to go on to even higher learning...which he wasn't planning on, if he was being honest with himself. School was so not his bag.