Struggling to find a foundation in mathematics worth 90 Ects points

I'm a 2:1 university graduate in computer science, and I'm thinking about doing postgraduate studies. The thing is that many of the degree schemes require at least 90 ECTS credits in mathematics as a requirement to enrolment in the course.

I don't have a mathematics A-levels, so I would need some foundation course that goes over the basics and bridges the gap into postgraduate study. I've done some searching but nothing has really turned up.

what are my options ?