90 I was reading an article the other day about the "Coding for All" movement going on right now (that is, the idea that everyone should learn to code because coding is good and there's a lot of jobs for it), and they figured that while the "everyone should learn to code" thing probably won't last, the idea of teaching everyone computational theory- computational thinking- likely will.
I'm guessing that your CS exam is mostly testing you on computational thinking.