Obviously the Advanced Placement test is not just any other high school test. You are going to miss questions. You are probably going to miss a LOT of questions. Don't give up. Keep taking it one question at a time. The more you get right the better score you will have.
Don't skip any FRQ essay responses. By doing so you will have to score 2 or 3 points more on the other FRQ answers. That is hard to do.
Follow this link to check out the site and you can input your own scores and see where you would fall.