Creative Cloud charging me when I have a free school account

That is not what you said in your first post. Or not what you inferred. You made it sound like you had just started your schools free CC plan and Adobe was also, at the same time, charging you a monthly fee.

Now you say the 1 year free subscription is over and you now have to pay for that subscription.

That is different from what you inferred.

So in the future I suggest you read the fine print on anything you sign up for. 

Adobe has an Automatic Renewal system for all their subscription plans. If you do not manually Cancel that subscription, before the renewal date, it will Automatically Renew.

In any event you need to contact Adobe directly.

Contact Customer Care

This is a User to User forum and Adobe employees only come here rarely comes here.

I suggest you talk to your school. 

Did you have an Adobe CC subscription before you went to school? If you did then that is what you are being charged for.

See if this link helps. If it doesn't then I suggest talking to the school.

Learn how to change your Adobe plan or subscription.