I went to a catholic high school and I hated it. I graduated with a measily 2.4 gpa. I am now in college in my 3rd year and I have a 3.1 GPA and made the dean's last the last two semesters. If he isn't pushing himself to do better on his own, what makes you think he will do anything on his own in college? He needs to learn for himself, not forced.