Have you graduated high school? I remember summer after I did I said I was in college now, even though I hadn't actually moved into my dorm. Plus everyone I knew started rocking their schools gear right when they got in. Afterall you are a college student the moment you enroll, and you're no long a high school student when you graduate. I'm just saying there was little evidence he was actually in college, and while both of us are making assumptions, mine are less of a stretch than the valedictorian not enrolling upon graduation.
Edit-
Also Peter was just stated to be a high school student in Amazing spider-man, high school spans 4 years, he could have easily been a junior if there is infact a two year difference.