Can't you take a calculus, though I recommend applied calc, online? There should be a bunch of options. And there are plenty of certificates you can get in data science now and then you could start working in the field while you do graduate work? Though I think you should do as much math as you can. You will need to know math beyond first year calculus. Math will help you with data science. Kings college London does a 4 year B/M degree. It is neuroscience but I think you can choose bioinformatics I think. Maybe they have something for you. In the nearterm, you should be able to start on the math immediately online.