Twelve questions, about fifteen minutes. At the end you will know which specific reasoning error is costing you the most points, by name, with the rule that fixes it.
This is not a score predictor and it is not timed. Every question is engineered so that the wrong answer you choose reveals something. Answer the way you actually would, not the way you think you should.
All twelve passages were written for this diagnostic. None have appeared on an MCAT.
These are three of twelve rules. The book is the whole set: the method, the worked examples, and the charting system that turns your own wrong answers into the only study document written specifically about you.
Nothing else, and no more than a few emails a year.