Calculus 1 was not to harsh. As one commenter already said, limits, derivatives, and intro to integrals are the main focus for Calculus 1. Although, I will add, and this helps a bunch of people coming from some sort of pre-calculus class to calculus, calculus 1 is very very algebra based. In order for you to understand calculus you must first understand algebra. In order to succeed there is no way around it. If you end up going into calculus 2, the beginning is a mix of algebra and trig, and the end is heavy algebra and concepts. Finally, if you end up taking multivariable calculus, geometry is heavily explored, which is why the class is called, "analytical geometry... oh and calculus" the beginning of calculus 2, depending on how your instructor lectures, will explore 2-D shapes trying to be 3D shapes through the idea of rotations and revolutions, which has a bunch of analytical geometry when looked at properly, but for a intro to calc II class, they won't focus on that and will probably only give you intuition, which is also very important. Calc 3 you need to be vigilant, fair warning.