Go through the training center, study units, and DEFINITELY do the questions at the end of each section. If you get a question wrong, it will redirect you to the right information to review.
Once you are done with your training, you can register for your exam, pay the $10 fee, and you have 7 days to take the test once you pay for it. (If you register today at 3:08pm, 7 days from today at 3:09 pm, it will lock. They give you three hours. You can skip and come back to questions you don't know, and you can review every question and your answer once you're done. They do turn on your video camera so you need to be on a device with a webcam. If you fail the first time, you have to wait two weeks before you can take it again; if you fail again, you have to wait a year, so make sure you're ready!