<p>To all those who have taken this exam and scored well, what would you say are the most important topics to study? To self-studiers who scored well, about how long would you say you spent studying for this exam? As a self-studier, I have put in around 40 hours, (rough estimate) but I can't help to be nervous, as this is my first year taking AP exams. Thanks</p>
<p>i got a five by using barrons after spring break ended. ~4 weeks before test</p>
<p>Focus most of your effort on pollution as that was a majority of the test.</p>
<p>Is it necessary to have the main energy units/conversions memorized? (kW, Joules, etc.)</p>