It is normally fine, with a few exceptions.
Other people have already mentioned pacing issues, but that's only a problem if you jump between sections.
If different sections have different midterms, then you really should go to the section you're registered in, because the prof will have prepared you for their midterm, not the other prof's midterm.
If there is any form of in-class participation marks (such as iClickers) you'll only get those marks if you go to the section you're registered in.
If you are going to a section that you are not registered in, and the room is full, then you have absolutely no right to be there. Even if you've been going to the section since day 1 and the class has never been full before, but the day before the midterm everyone comes for a review or something, and there's no room left. You are taking the seat of someone who is actually registered in that section and may not be able to go to any other. I am emphasizing this because I am assuming the reason you aren't registered in the section you want to go to is because it's full, otherwise you would just switch into it on SOLAR without a problem. This can also be a problem if a class is at a more convenient time (ex, two sections with one at 8:30 and one at 10:30, everyone wants the 10:30 class) or one section has a much better prof than the other. I've seen both happen, and then people who are registered in the popular section have nowhere to sit, which really isn't fair. If there is room in the lecture hall, then this isn't an issue.
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