Is your concern non-math related questions or is your concern unpredictability of the test?
I have some sour news.... I don’t think there is a trend really.... There are definitely some variations - some people for example will get four reading comprehension passages in a row and some will get more non-math related questions and others will get super easy questions while some folks will get super hard ones. There’s quite a bit of variability on the test but it doesn’t mean there is a trend.
The fact that a certain number of questions is experimental is also makes it very hard to determine what matters for the score. However, there’s no exact formula for how many certain questions you will get. We’re not told how many non-math related questions there will be. That may be one or maybe a lot you need to be prepared to perform the best you can.
I would say that it is actually counterproductive to change the test significantly and make the scores noncomparable for GMAC so they’re not motivated or interested in really changing it. There are definitely some weird things happening but that’s more of a side effect of how the test is built and how it works as opposed to some bigger change.
Just my 2 cents.