I did really well on test 1 and 3, and on test 2 I got _every single one wrong_. Like, not even one right by accident. I think I found the 'same vs different'

I did really well on test 1 and 3, and on test 2 I got _every single one wrong_. Like, not even one right by accident. I think I found the 'same vs different' dynamic really difficult compared to discerning the two types.