How am I failing exams I thought I did really well on?

<p>I took a test in AP Calculus BC yesterday, as well as a quiz in AP Macroeconomics today. I thought I did well for sure on both tests, yet I just found out today that I got in the low 60s on both of them. I don't understand it, because I thought I was only getting a couple questions at most on each of the exams wrong. As a current senior in high school, this makes me very worried that it could really drag me down in terms of grades and college admissions. I got several A's, whether test or quarter grades last year, but I just don't know why I'm having such a bad start grade-wise to my senior year.</p>

<p>Check what happened when you get your tests back, its easy to miss a question that you thought you got but had some doubt on</p>

<h1>2 pencil</h1>