My son is obsessed with coding, to the degree he’s asked for extra a level maths tutoring “for fun”. He’s currently at college and will be heading to uni to do computing in September. He wants to learn more about calculus and quaternions but the maths tutors I’ve approached so far have said this isn’t something they can help with. Should I be looking for a computer studies tutor instead? A pure maths tutor? Haven’t a clue how to phrase the ask on Facebook groups, can anyone advise?