The semester has kicked off and you're no doubt starting to feel a little more comfortable with your schedule and are easing into your new class curriculum. Attending class each day is vital in learning the material, but you need to also pay attention. At this point, it's common knowledge that if you write something down, you're more likely to remember it. This works in several ways when you're a student. First, if you're taking notes during a lecture, you're more engaged in the material, second, by writing it down you're more likely to remember it, and third, because you wrote it down you now have reference material to use later for studying. Taking good notes doesn't start in the classroom, instead, you should get primed before you get there.
Be prepared: Do your homework and reading before you get to class so you're familiar with the content.
Pick a good seat: For some, this will be near the front of the room so the material can be better heard and seen. For those that thrive on distraction, sometimes off to the side works better. Know yourself and pick wisely.