I got a 4 on my Chem AP which means I can get credit for it. If I fail my Chem placement test, will I still be able to use my AP credit or will I have to take chem again? I’m majoring in mechanical engineering so with my credits, I should be able to get out of chem and only take one lab (required disputed credits). So do I have to do well in my chem placement? Or does it not matter?
I think you need to do well on your placement test as well. You shouldn’t have a problem with it though if you got a 4. For comparison, I did well enough on it to test into Orgo and I also got a 4. I wouldn’t sweat it at all
@96blue I took chem two years ago though and am a bit stressed because I don’t know how in depth to study 
I got a three, took it during my junior year. I needed to pass the placement exam to get credit, so I reviewed my prep book literally the night before for about four hours. I tested out and it was surprisingly much easier than the AP exam. Expect questions from topics like empirical formulas and trends. Nothing too difficult. Also, I don’t think you need to place out. For LSA’s AP credit information, it doesn’t say so.
Check this out http://admissions.umich.edu/apply/freshmen-applicants/ap-ib-credit. I think with a 4 you’re fine no matter how you do on the placement test.
http://admissions.umich.edu/apply/freshmen-applicants/ap-ib-credit#LSA
As far as I’m concerned from what this website says, the placement exam only places you into Orgo if you got a three on the exam. If you got a four or five, you are free to elect Orgo regardless.