If you're upgrading, additional fees will be pro-rated during your first partial month, so you only pay for what you use. Here's how to upgrade:
If you're currently a College Pack subscriber and you'd like to downgrade to a Campus Pass, you need to cancel your existing subscription. You'll have access to your College Pack subscription through the end of the current billing cycle.
Once that cycle is over, you can transition to a Campus Pass subscription by signing up for the school of your choice as a new subscriber.