Completely frightened about starting college (please help!)?

It's not surprising that you need a refresher for Chinese. Language is a one of those things where you either use it or lose it, and I'm willing to bet that you can't remember the last time you had the opportunity to use your Chinese. What is concerning is the fact that you're taking remedial algebra as an engineer. Whether you got lucky in high school or not, your math is going to need serious improvement. It's important to remember that you tested into that class for a reason; you wouldn't do well in a calculus class if you're testing into algebra. Realize though that you're going to have a lot of catching up to do. If you're really going to do this, I would strongly recommend getting a math tutor. Getting help early on will make a huge difference in your performance, and tutoring is likely provided by your college for free (or is very reasonably priced).