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Dyscalculia, like Dyslexia or Dysgraphia, can be alleviated, but students need accomodations. You can't get out of it.
The fact is that Intermediate Algebra, RIGHT NOW, is blocking tens of thousands of students. If they have to take that class two or three times then drop out, what does that prove? Being placed in Intermediate Algebra is the most direct cause for students who are doing well otherwise to be "blocked", can't take any non remedial math class and thus can't progress further.
We can absolutely work on making that class better, right now.
One way that's been experimented is to NOT place these students in Intermediate Algebra but placing them in a non remedial class where they get extra support (but this is expensive and requires special training; on the other hand, it works). For whatever reason, Intermediate Algebra is a stumbling block for students who, placed in another, higher class level and provided a tutor and a special review, can pass. That's promising but requires a LOT of work from the college (for design) and the instructors (for implementation), and thus extra funding.
I really think we need to do all kinds of things better.
But we can't fix the secondary school system for the current students who are "blocked" by Intermediate Algebra. We can't go back to 1994 when the CA secondary system was one of the strongest in the US nor do Californians want to revert to the formula used back then. We have to help the students we currently have in the system and find a way for them to show they can succeed.
He could take it online even if it doesn't count in GPA, since your HS will be counting the 4 years of CS. You'll report the language study on common app and on applications since it's for college applications.
He could also take 2 semesters from a community college, that would count as reaching level 3, but be aware the pace in college foreign language classes is brutal.
Note that most colleges have a foreign language requirement for graduation so he'll need to learn a foreign language (not CS).
A CS language isn't a foreign language: it does not reflect a people, a way of life, and a way of thinking, it doesn't provide insight into English or another culture. Cs is a very important field but in most school districts it's considered a science (definitely uses logic and some math reasoning).
The easiest foreign language for a native English speaker is Italian, then French (if he intends on completing through level 2 in hs plus one semester in college) or Spanish (if he only intends on taking it to level 2, then switch in college - elementary Spanish is quite easy, intermediate Spanish becomes quite hard due to multiple conjunctives.) Portuguese is another relatively easy language to consider.
You have to think like the college: why should they admit you? Why you and not someone else? What will you being to their school, campus life, class discussions?
Wishing and wanting is of zero interest to them.
So,now on, make yourself the kind of candidate they want.
If I read you properly, you have summer jitters (you worry the school you'll start at in the fall will be too stressful) doubled up by the fact your mom forced your hand so you can't really "own the decision" and so you want to blame her for the jitters.
Wellesley has thousands and thousands of qualified applicants. It only admitted you because they know you can do the work.
As for pressure... Here's the secret: don't look at what others are doing. Give yourself three reachable goals (for instance, make a 3.0+ ; make friends in three different circles like class/club/dorm/sport; do one activity you'd never done before). Success is defined by what you do, not what others say they do. Stress often comes from comparing yourself to lots of other people.
However if stress really is a big issue for you, go to the counselling center during orientation and make regular appointments.
Finally, hurry and buy the Naked Roommate, and read a couple section per day. ;)