Exams are by course, not by class. Every first year eng student in 1ZA3 (with the exception of those who write through CSD/are sick) will write the exam on the same night. Rooms assigned will be sorted by name or student number or something, so it doesn't matter what core you have.
Technically, you can just show up to Childs' lectures, but you should try and get a spot on SOLAR first. That being said, Childs' classes are almost always full, to the point that so many people hear good things about him that they'll show up to his classes anyway, like you're considering. The thing is though, because everyone thinks they love Childs, his lectures actually leave some students without seats if they show up too late. It'd be fine if it was the people who aren't in the class were losing their spots, but I know people who are actually in the class who had to chill at the back because other people are taking their spots.
For every other course, that strategy is pretty much OK. But for ones that have blatantly popular profs (i.e. Childs for math(s), Zurob for materials, etc.) lectures can overfill and it really sucks if you're the one losing your spot to someone who's not supposed to be there. Just consider it before you start showing up, or (hopefully) be prepared to leave if someone else needs a spot.
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