<p>aubrey,
I dont think theres really any class you must take. The only thing I can say is dont take all 18 credits unless youre 100% sure you can handle the shock.</p>
<p>I recommend taking at least one easy class every semester. That way its easy to balance out if you do poorly in another class (I think someone else mentioned this already). Ask around to find out which classes are relatively easy, but beware of the very easy A classes, sometimes they can suddenly get really tough when the profs think theyre becoming too easy. I prefer the moderately easy as they usually stick to the program for years.</p>