It's pretty cool that you remembered everything for PreCalc... I had two years between Calc I and II and was completely lost during the first couple of weeks of Calc II. It's a strange feeling to be in that situation and have light bulbs going off in your head that you didn't realize were there in the first place.
As far as meeting people, that's not very surprising for a CC... I took a couple of summer classes at one, and it's not like a regular university where you would generally have to live on campus the first year and take classes with the same people you live and eat with.... group work helps, and people tend to lighten up a little after the first couple of classes, as people start asking questions and are less stressed about the class itself.
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