Good luck ... university is probably the most fun time of your life (well, it is for me -- I'm a sophomore right now). You live with my friends, you can get involved in lots of great extra-curricular programs, there's great food, lots of parties, and so much to do all the time.
I study Television-Radio at Ithaca College, and I'm trying to do a second major in either Cinema & Photography or Journalism. Television-Radio is the complete opposite of Aerospace Engineering, since yours is lots of hard science, math and technical stuff. Mine is mostly aesthetic and social science stuff.
As far as studying goes, I'd say I study several hours a day before a big test, and I usually do fine. I honestly don't have to study very much, since I don't have many tests, per se. I take mostly analytical or television production classes, so instead of traditional exams, I have to make video productions, sound files, presentations and write a lot of papers (I wrote more than a million words, including one 300-page book (a group project) last semester). But personally, I'd rather have a project like "make a five minute music video with lip-synching" instead of a test. It's a whole lot more fun.
I do have a lot of reading, but I can get away with only skimming most of it.
This semester, I am taking Advanced Studio Production, Introduction to Field Production, Film Aesthetics and Analysis, Microeconomics and a Seminar in Critical Thinking. I am also working on three TV shows on my college station -- a sketch comedy show (I am the Director of Photography), a movie reviews show (Lighting Director) and a show that plays student films (Sound Board Operator).
I haven't taken any of the classes you're taking except Calculus B... which I actually took in highschool for college credit. It isn't too hard as long as you pay attention and do practice examples regularly, whether they're assigned or not. Make sure you understand graphs and functions *really* well (that you can "read" a graph quickly, and find trends without a lot of pondering).
Anyway, good luck at TU Delft!