Classes in general are more enjoyable in college than high school.
The best part about them is that you can have a break between classes and get other things done rather than sit in multiple classrooms in a seven-hour span. Although college classes may be more difficult, the challenge is nice because you can accomplish so much more and take what you learn and turn it into something that you may do in the future.
Some differences between the two environments: The professors are not as lenient in college, and you have to get everything done that is asked and turned in on time. In high school, teachers were more tolerant with assignments and let you turn in things later without punishment. Also, in college an abundant amount of classwork and homework is done on the computer. It is very important to keep track of your responsibilities and agendas, especially if you have extracurricular activities.
There are not many similarities, as I have found. College life is so much different. You are on your own with everything, but it is not too bad. I was told to not take high-school habits with me into college, and that was the most useful piece of advice that I was given.
I am still learning and getting the hang of things quickly.