I would advise all students to take advanced algebra/trig and calculus in high school if they think there is any possibility that they will have to take calculus in college.  Calculus was hard enough after taking these courses in high school.  I would have been completely lost if I had chose not to.

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Take all of the math you can!! I took math all four years of high school and got to UGA wishing I still knew more.  The work is not he most fun in high school, but it definitely pays off at UGA.