I think that some of the best skills to learn in college and life are curiosity and critical thinking. No matter what your job is there is always something new to learn to make things easier or better for you. You have to embrace a lifelong love of learning and asking questions; while simultaneously not taking everything at face value.
While it is important to go into art school with some basic knowledge and fundamentals, just remember that you're there to learn. If you already know everything there wouldn't be much point in going to school. So it's okay to be nervous about maybe not being the best, just keep in mind that many people will be in the same boat. Be open to receiving advice from others and asking questions.
For example, art isn't just about learning perspective and color theory, you should learn anatomy to make believable fantasy creatures, physics to make functional vehicles and buildings, history to pull from examples from the past and trends for the future.
I hope that this all makes sense. Good luck!