A piece of advice for Percy is maybe boosting his confidence.

Why I give him this advice because he has ADHD and he thinks that he is getting pushed away by others and not fitting in, for example: “Taken together, it’s almost a sure sign. The letters float off the page when you read, right? That’s because your mind is hardwired for ancient Greek. And the ADHD—you’re impulsive, can’t sit still in the classroom. That’s your battlefield reflexes. In a real fight, they’d keep you alive. As for the attention problems, that’s because you see too much, Percy, not too little. Your senses are better than a regular mortal’s. Of course the teachers want you medicated. Most of them are monsters. They don’t want you seeing them for what they are.”  even though he is just talking about the meaning of ADHD he is saying like he does not fit and he will never fit in and it is like he is really upset and embarrassed when he can’t sit well in class he is disappointed in himself.

He will need to boost his confidence because he needs friends and he wants to fit in but because of ADHD, he just needs to ask and make friends normally and not think of his disses of ADHD then he will act normally in the article/video says that you need to relax and not think of how people can exculed you but think of the things that how people can include you. Then he would make more friends.