How many questions were there per column (except last one), I believe 18?
In AM exam, with exception of first and last columns, Bs and Cs were dominant. It seems to me that As and Ds were in low teems each. However, at one point when I started growing concerned, I had A A D sequence. While, unintentional it definitely helped me to calm down.
PM part was similar, but I think the distribution of answers was more even.