Being late for class. Yes, preteens have loads of energy, but even they find it challenging to move from class to class on time. The consequence for lateness can be detention. No kid wants to get in trouble because he wasn't fast enough!
What you can do: Reassure your child that he's not alone. Brainstorm ways to streamline the process. What will he do if he's not sure where a particular class is located? Who will he ask for directions (for example, the teacher of his previous class, or his advisor)? Is he good at keeping his books and papers organized? If not, help him clean up the mess so he doesn't waste precious minutes between classes. And remind him that he'll have to save socializing for lunchtime or after school.