Check Elearning through goWMU a few days before classes begin. Some classes will have course content viewable and you can get a jump on assignments.
The first day of class is important. Make sure you attend all of your classes, arrive early, sit near the front, and pay attention to the syllabus. Bring something to take notes with, e.g. pen and paper or laptop.
Visit your academic advisor. If you have questions or concerns about your schedule your advisor can help you make changes to your schedule before September 9th.
Don't be nervous. You won't be the only newb on campus!
