Well, he might get into all sorts of trouble. Maybe he'll show off his demigod skills during a gym class and shock everyone. He could also meet some new friends or enemies who are part of Annabeth's school world. And perhaps he'll get involved in a mystery that's specific to the school, like a strange disappearance in the library that only he can solve with his unique abilities.
There could be a school janitor who is actually an old demigod who retired from the hero business. He could give Percy some valuable advice based on his own experiences. And of course, Percy will surely meet Annabeth's classmates, some of whom could be friendly and some not so much, depending on how they react to the new boy in school.
One possibility is that Percy clashes with the school's jocks or popular kids. Since he's an outsider, they might pick on him at first. But then Percy shows them what he's made of, not with brute strength necessarily but with his quick thinking and his ability to outwit them. He could also get involved in a school competition, using his unique skills to help his team win.
Well, she might immediately stand out. She's super smart and used to a different kind of education in Camp Half - Blood. At Percy's school, she could ace all the academic subjects, especially in areas like architecture - related studies since she has a passion for it. Maybe she'd also get into some trouble with the school bullies who don't like smart new kids. And she'd probably befriend Percy's other friends, but also keep a bit of an air of mystery about her demi - god status.
Well, she might cause quite a stir. Maybe she'll outshine everyone in academic competitions, which could make some students jealous. And she could also form a study group with Percy and their friends, sharing her vast knowledge of mythology and ancient civilizations.
He'd probably adapt slowly. At first, he'd be confused by the normal school rules. But he'd use his street - smart skills. He might use his swimming abilities to shine in the school's swim team if there is one. And he'd rely on Annabeth to explain things like how to use a locker or where the cafeteria is.
Percy could meet the school bullies. And they might pick on him at first, but then be in for a big surprise when he shows his strength. Also, he might encounter some teachers who suspect there's something different about him. Maybe a science teacher who notices his quick reflexes during an experiment or a history teacher who is amazed by his knowledge of ancient mythology.
In the fanfiction, when Annabeth goes to Percy's high school, she would probably form a study group. With her knowledge, she'd help Percy and his friends get better grades. Also, she might start some kind of architecture or history club in the school since she has a passion for those things.
Maybe Percy would struggle to fit in at first. He's used to a different world, like Camp Half - Blood. But with Annabeth by his side, he could start to adapt. He might make new friends or get into some trouble with the school bullies, only to show off his demigod skills in the end.
She might initially be a bit of an enigma to them. But as time passes, she could become a great friend. For example, she could help Percy's friends with their homework, especially in subjects like math or history that she's excellent at.