Unfortunately ST9 has no SA level that directly relates to it. Quite a few people I know have picked investments but I don't see why ST9 can't be paired with life or gi. So I would say look at the syllabi of all the SA's, see which one interests you and then pick the ST mentioned in the syllabus that is a prerequisite for the SA you chose. Otherwise you will be in a situation where you'll have to pick a third ST to read just so you can understand the SA content. I'm assuming here that you do not want to do that.
Last edited by a moderator: Feb 25, 2014