First semester credit limit : 12 credits, 1 lab at most. Give yourself time in between classes and overall begin to familiarize yourself with college life. Honestly way too many people get dominated their first semester simply because they aren't completely used to college life and don't manage their time well. Overall first year should be for learning how to study, manage time, and still have a life while taking classes. So try to take it slow...
+1
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and if you've got AP credits for Chem or Bio, do yourself a favor and don't take organic chemistry your first semester.
Also +1
Orgo is a notoriously difficult class, and AP classes just aren't sufficient prep for upper level science courses. They are, in essence, high school classes taught by high school teachers, and don't emphasize the critical thinking skills you'll need to develope to do well in upper level sciences. I, personally, would NEVER AP out of a general requirement, for several reasons.
1). Lower level science courses are a great way to pad your science GPA. You can afford a B in an upper level science course if you have plenty of A's in lower level science courses. Plus, leaving freshman year with a 3.7-4.0 GPA is a huge stress reducer! If you start off with a 3.2-3.5 GPA because of a heavy course load, you have all the stress of having to get straight A's in harder science courses! Gah!
2). Orgo is a notoriously difficult class. AP Gen Chem and Bio WON'T prepare you for it. They are high school courses! In my opinion, taking Orgo your freshman year would cause undo stress and bad grades. Like Serenade said, take it easy, and spend freshman year learning what study schedule works for you, how you learn, and how to be independent.
3). A lot of med schools won't except AP credit for their pre-requisites, even if your undergrad university does. And quite frankly, and A in a college level course looks a lot better on your transcript than T credit...from high school.