Hello... I'm one of those who switched from Sci SPM to Arts STPM.

Math S may be simpler in that we don't have Trig and Poisson, but we've plenty of other statistical formulae to fumble over, heh.

I can't say that Arts is easy lah--it really depends on whether you're interested in it or not, eg. Economics/History not everyone can tahan. And if Sci has a lot of depth to it, well Arts has a lot of breadth. We can't really predict what they will ask, especially for more relative stuff like P.Perniagaan because the subject matter (as opposed to the syllabus) changes according to the present.

Bottomline: You must be (at least 50%) interested in what you study for STPM... it requires stamina to get thru' the 1.5 years!