When I first compiled the DSST Difficulty List, I had the Introduction to Geology DSST (then known as "Physical Geology DSST") rated as a “Level 2” in difficulty. A friend on base took the exam and assured me it wasn’t that hard. Well... after digging into the subject matter a bit more, I’m going to respectfully disagree with that assessment. If you’re coming into this with zero geology experience or background, you’re definitely going to need to study. The good news? I’ve found plenty of people online who were in the same boat and managed to pass after a few weeks of focused prep. So, it’s doable—but don’t expect to wing it. Personally, I still think there are easier science exams out there. The Natural Sciences CLEP and the Biology CLEP are both broader in scope but don’t go quite as deep into any one topic. If you’re still in need of science credits and have already knocked those two out, then this exam might be your next best bet. Bottom line: If you’re willing to put in the work, this exam can be passed—even if you’re starting from scratch. Just don’t let anyone convince you it’s a breeze unless they’ve got a geology background.