<p>The number varies from year-to-year. I've been advising my students to shoot for 75 to play it safe, so that when they miss a multiple choice question due to stupidity and didn't answer a free response question as well as they thought they did, they still end up closer to 70, which probably should be a 5 more often than not.</p>
<p>As long as your practice scores have generally been improving, you'll probably be fine. That being said, it probably wouldn't hurt to brush up on a couple of topics that are easy to brush up on and that you're making some simple mistakes on.</p>
<p>Remember that everything has changed because you now can guess with no penalty added for wrong answers. Because of this, the curves are going to go up, so you can’t really use any old curves to judge your score. Don’t worry about it though; i’m sure you did just fine.</p>