I attend a community college but it is not necessarily easy. What has helped me is to use a planner, don't take more than three or four classes at a time, and my personal homework method is to write down two reasonable homework assignments with the to-do check mark box next to them, so as not to confuse the assignments due with the work that I need to do. I started feeling very overwhelmed because I had book reports and many papers due and couldn't remember when to do what, so I would write down "read ten pages of such and such book" or "do six math problems" and by the end of the week the whole chapters are done. This is what helped me, anyway.

Be on time, don't be absent, use a separate folder for each class, get your scantrons ahead of time, always do extra credit and exam reviews, and don't wait until the last minute to start a report or major project. What helped me is to have one folder for each class rather than a big binder or notebooks. I find paper to be more useful than notebooks, since at times I need to rewrite my notes. Also, if the teacher is lecturing too fast, just write bullet points of what they are saying and do your own research to fill it in later.

Make friends! Join a club! I joined one and I have new friends now, and we even went on a field trip last semester which is the funnest and happiest thing I have done since a field trip in 12th grade.