How hard is college physics ?
If you are referring to the first college physics course, that is the general physics course that covers almost all areas of physics, than it is pretty easy. You will mostly go over all the material you coverd in high school but the bonus is that you will do it with calculus. Now this might scare of some people if they are not familiar with calculus-based physics, but the matter of fact is it makes much more sense and a lot of things click and are more intuitive once covered with the notion of basic derivatives and integrals in mind. All in all, it will be about the same difficulty as AP physics. P.S. I strongly recommend Halliday Resnick Krane Fundamentals of physics (fifth ed) if you are taking the course. Very well written (although quite a bit more challenging than other alternatives) you will learn a lot from it. Hope this helps, wish you luck in your physics endeavors.