I’d be surprised if you will be able to get into a 3000 level econ class as a first year student. I also wouldn’t recommend jumping into a 3000 level class as a first year, until you get used to college level work. Some students don’t even get into the 2000 level econ classes their first year - particularly when Mr. Elzinga was teaching, because he was so popular. (Did he retire?)
Also, for calc, you have a choice of taking a more intensive 1000 level calc class than the class taken by the masses.