How about the first 1/2 of questions systematic, the second half random?
Thats what I'm doing.
I did an organ based review, checking off path, pathphys, pharm, and phys on the left and the organ system on the right.
Then I did a subject review for immuno, behav, biochem, anat, embryo, etc.
I made sure to only use 1/2 of the questions.
Then I made the remainder of my tests selecting unused, all disciplines, all systems.
Got about 500 left, averaging around 75% or so, between the mid 60s, and mid 80s.