I'm taking AP Calc BC and AP Stats senior year. I've heard that stats is a relatively easy class and that the AP exam is a breeze. I took PreCalc last year and thought it was incredibly easy, but I guess it probably varies from school to school
AP stats is easy for the most part, but gets a bit difficult towards the end of the curriculum. pre calc is easy though. taking two wouldn't be too challenging, i'm sure, as i did that junior year and i managed well.