Hey Michelle
I would have to say the sciences would not go amiss, especially biology and maths, plus a very good grounding in language (grammar spelling etc) .
Beyond that, I don't think it is possible to get certified for common sense, logic and organisation skills. These would probably get you through most contextual content, leaving just the CPD element of keeping up with modern technology.
Hope that gives you a starter point, together with anyone else's answers
Jess!
