<p>if you were an a/b student before, and suddenly got a D, i am pretty sure the admissions officers will be very suspicious.
maybe you can write a letter or something to explain your situation.</p>
<p>Ask your teachers if they will let you do extra credit to get your grade up to a C- and then get a tutor or do whatever it takes to get a C or better next semester.</p>
<p>Does your school weight AP grades? Because then you could pull your weighted grade up to a B, and that would look muuuuch better. Some colleges don't look at your weighted grades, or weight them differently, but it's still a little ray of hope....</p>