HAFTA/WANNA
I believe that after high school there isn't much change in character since nobody can change their person that fast unless it's something simple like changing the way you tie your shoes. It is not possible unless someone is determined to change greatly in such a short amount of time. And from what I've seen from my fellow peers it doesn't seem like they'd be capable of that great of a change in the span of possibly a couple months.
Though when moments in life are dark people are more inclined to take drastic measures to find the light again. Honestly the only difference is that there will be more homework and more responsibilities and more stresses that need to be taken care of before you can do things for yourself.