<p>It’s is really easy to overload, and at some point most people do it.
A few things important things to know: each science class is actually about three classes. Bio 110 is only two classes, because there is no lab, but there is a 2 hour recitation every week. Most other science classes however seem like three classes because you have lecture 2-3 times a week, recitation once a week, possibly lab lecture once a week, and lab. So while overloading is definitely possible, in sciences be very careful, or you will find yourself drowning in lab reports.</p>