since percy had ADHD and dyslexia, its hard for him to concentrate.
aside from the differences he has, percy also has monsters to fight and demigods and god to deal with.
while percy in the the real modern world doesnt focus on his school work and had dyslexia causing him to have trouble with reading.
but on the battle field, he can fight any monster including another demigod.
but espically in the lightning thief, percy doesnt pay intention to his "friend". his friend luke tried to lead percy into tarturus and had the gods frame him fro stealing the lightning bolt and helm of darkness. he didnt focus on the fact that luke betrayed him and someone would obviously frame him.
hope this helps! :)
