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Is it just me or are the stimuli of the older PTs... different?
After studying a set of about 100 must be true and must be false etc questions, I noticed that more than 90% of the ones I missed were from PTs that were quite old. I note the stimuli because they tend to be the ones that I understood less.
Any takers?

I agree, they're definitely different.

at least one person agrees :]

Between PT1 and PT31, I have not experienced any noticeable changes in the overall difficulty, so far, and that's the most important thing. The earliest tests had incredibly easy parallel reasoning questions, though.