One thing that is pretty obvious is not to slack off during class.

I never paid attention in my math class and that is a big regret of mine. Because I never paid attention in class and slacked off, I had to drop the course.

Slacking off leads to failure. You need to work hard and pay attention in class or else you will struggle.

Struggling in class is not good, especially if you are not paying attention.

Pay attention in class, ask questions, study, do not slack off during class. You can miss something important if you slack off. It may seem like a boring class, but you need to get through it while paying attention or else it's wasted time.

Slacking off is bad, you cannot keep doing it.

In high school I got away with it because it was easy. But college is a different experience, college is more difficult than high school and it is bad to be slacking off.

You need to stay focused or else you will fail, and you do not want to fail.

Do not slack off, do your school work on time and pay attention in class. Take notes and do not slack off. Keep working hard or else you will fail.

Take my advice, do not slack off. Slacking off will only lead to failure and it can really mess up your plan in college. Not to mention it also ruins your work flow because you just get lazier and lazier.

Do not slack off, that is all I must say.