Exaggerating or no, this clearly isn't some manner of Peter just not trying. No kid takes to a bad grade well if they're really being honest with themselves, besides. His faces falls.

"...Why didn't you tell me, mijo? I'm not a spell caster either but I am a TA. We could've been talking to your teachers, trying to study together by now." He sighs. "Okay, bow on hold. Lets see what you've got and what you can do."