@atzhang6v6 said:
Do you think they are helpful in knowing how they design the questions and what their thought process is?
(How they get to the correct answers etc.)
Yes, yes and more yes. I think its like "seeing ...
@dml277 I would recommend purchasing Super Prep II. This board was recently discussing how useful the official explanations are. Even if you already have PT 62 and PT 63 (other two tests), I would get SPII.