You may well be right--the test was given a top-to-bottom redesign in 2016, so you would have been just before that. Nowadays there is a calc active and calc in

You may well be right--the test was given a top-to-bottom redesign in 2016, so you would have been just before that. Nowadays there is a calc active and calc inactive section, whereas the current ACT has one math section, all calc active.