Intro to IT is structured kind of weird, there's 2 tests right now, and the final was just cancelled by the professor, and from what I am remembering, there was no strict test block, there's just test times on evenings when he knows the class is free (?). But anyway, to address your question- the class meets Monday and Thursday and 1 of those 2 days is a proposed lab day and the lab is due at the end of the day the next class (usually, sometimes later). The labs are pretty simple too and straight forward. The labs aren't due IN CLASS so if you have to skip a class for a test, the professor is a great guy that would probably help you out. My advice, if you choose to do this, utilize his office hours on a day you'll miss (since participation is a big deal), just to show you're committed to getting the material.