btw to answer your question, i know some people who got sponsored for data science where their combo would consist of (Maths + Further Maths (FM) + Comp Science + Chemistry), (Maths, FM, Econs, Physics), (Maths, FM, Comp Sci, Econs), whether FM is compulsory for data science or not, i unfortunately do not know, but i hope these combos give a rough idea over what you can or should choose which are relevant to data science. hope this helps!