Thanks for all your answers, doesnt sound too bad actually.
My two main subjects were math and physics (the german system is obviously a bit different) and I got something equivalent to an A.
One of you pointed out, that I'm not a mature student, but if the definition of being 21 at the beginning of your degree is right, I'm going to be a mature student!?
My first gap year gave me quite some motivation (which I certainly lacked before) and from what I hear, some talent combined with work could do the job (if one gets accepted), which is really good news.
I'll now read the links you gave me.
BTW, do you think many mature students apply for math, because some of the colleges even discourage taking a gap year, not to mention taking two of them!? Does one of you know anybody, who applied as a mature student?