Anyone here know what upper level math classes are like in terms

Expect to watch at least -1/12 of your classmates commit sudoku

>>9102719
If your fundamentals are solid (Calc 1,2,3 if you're American) + Linear algebra as you described, the only thing you should need is some sort of class that goes into proof writing (Discrete Math). Otherwise you really should be fine as long as you take it seriously and properly manage your time. Also study correctly and efficiently of course.

>>9102719
http://4chan-science.wikia.com/wiki/Mathematics#Overview_of_Mathematics

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It's not unheard of for instructors to lure students to their office hours so that they can trap them and forcibly anally penetrate them. Be careful who you trust.