I completely agree with Altius tutor here. I don't necessarily disagree with anything else that has been posted, as it is well reasoned. But I think Altius tutor and I are looking at this from a perspective that is different than others. As a teacher, many times I have heard a student say, "I wish I would have known this when taking that class." Reviewing the conceptual perspective, even in a college class that emphasizes math, can only help. If you have a good conceptual understanding, then you are better able to estimate where an answer should land, which helps when recognizing mistakes on your midterms and final.
I also agree with Altius tutor that there are MCAT books on the market that emphasize memorization and this could actually be a disservice in the long run. The right books used the right way will ultimately put you in a better place when you take your midterms and finals, as well as give you a head start when you start your MCAT review in earnest. I know two chemistry professors at UC schools who actually recommended this to their premedical students.
I also agree with Nedsson's comments that many school questions, such as the titration pH one he presented, are not at all like the MCAT. You need to realize this, and be able to discern what is MCAT-relevent in your class. At the same time, there is a cool trick form an MCAT book that would make that school question significantly easier.
What I would suggest at the very least, is that as you study for your classes, keep a journal of any mnemonics and helpful tips you get from your classes. In a second journal, write yourself conceptually-based multiple choice questions with answer explanations in the classes that correlate with the MCAT. Even if you only write ten questions per class, what you learn in writing questions with answers will serve you well when it comes time to start taking multiple choice questions, in practice and on the real MCAT.