Chance me please! - French Student

Hi there, first post!

I’m an international student from France, and I’ve already applied to my wanted colleges in december.
I’m in my last year of high school (Terminale) and in the Scientific series, with ISN (Informatique et sciences du numérique) as option.
I would like my chances, but also if I have to wonder as much as I do right now. I’ll explain.
First, here are the universities I attended:

NYU
Pace University
UMass Amherst
BU
Drexel University
College of Charleston
All 9 UC campuses (so not SF)

The thing is that I already received a “decision” from umass, saying that they couldn’t look forward for me for my selected major: computer science. So I’m starting to freaking out a lil bit, but I guess that’s normal?
Here are my test scores:

TOEFL IBT: 95 (passed on april 9th)
SAT: 610 ERW 640 Math 1250 Total (passed on may 7th)

I don’t have any GPA as I’m in France, but my mean was around 14-13/20 during high school. I always have been the lazy one who doesn’t work but is in the average (and who is perfectly ok with it) but this year, it is different. I always had an average of 14-13 in maths, but this year… I’ve got 9 and it’s like it’s going down! I’m working hard to get 10 (which is the average) but it is the general average; I don’t think that’ll make it if I want to go to this kind of universities.

My marks in english are around 19, I have 16-17 in European English (another option) and I’m fine with every course this year, which means around 12-13; it’s just math that takes me down morally because I know it is >very< important. I’ll have to send (after translating) my first term transcript through the common app soon (mid year report), that means my 9/20 in maths.

For >your< information, I guess colleges don’t give a damn, I always loved maths, really. I’m reading a lot of books on it, not very technical (the more philosophical ones) just for the passion of math, but this year… Let’s say my teacher is horrible, and that is seen on my marks. I give a lot of importance in teachers (at least in HS, I know in university it’ll be totally different) and this year mine is horrible, my classmates are complaining about her, even other teachers, and even supervisors, to tell you her reputation! But she’s old and has experience, so they won’t do anything. And as long as you have a teacher, you have to stick with it for the rest of the year, so I know teachers aren’t an excuse, I have to work for myself, but it’s just to give you the situation.

So my question is, do I have to worry? Do you think I have big chances to do not get accepted in any of these schools?
And UC says that if I fail to earn a C or better in any class, I need to contact them. Is it the case here? Does my 9/20 in maths represent a fail, knowing that all my courses are above average, and I’ve always been good in maths before? And I know every college has his own FRENCH - USA marks conversion chart, so I prefer to ask.

Also, I’m ok financially.

Thank you very much for your time.