Aside from studying for the test, make sure to review the "What things do I need in order to take an online proctored exam?" section of this page.
Next, read the instructions in your course. Your course should contain a module called "Online Proctoring Orientation and Setup."
You'll be guided through the process of setting up a profile for proctoring, and taking a practice exam. The actiivities in the Proctoring Orientation module should have due dates well before the date of your first exam, so you'll have plenty of opportunity to get comfortable with the proctoring process.
Once you've successfully completed the Proctoring Orientation, we recommend that you use the same computer, physical environment, and internet connection for all of your proctored exams in the course.