I'm not sure if the question was clear or understood. I will not have access to labs, sine I will not be studying at a college, and so the sciences seem unaccessible. Maths and further maths can be self-studied fairly easily, with only the exam centres to worry about at the end of the year. Most mathematics and computer science courses need 3 subjects to study. Which might be best?
Economics might be an option I hadn't considered.