In reference to when I took it in October, I felt great about the morning session. Only had a couple I couldn't come up with an answer for.
In contrast, the afternoon killed me. :D But I was able to at least eliminate a choice or two on some problems so I'm going from 25/75 to 33/67 or 50/50...
This isn't for the April exam, but in October I had 49/80 and didn't pass for the Mechanical Systems and Materials exam. They gave a bell curve to show where I was in relation to passing candidates, based on that my guesstimate was the cut score then was approximately 55.