The two people who used NIE in this thread said it was pretty sub-par.
I haven't really heard of anyone i know doing NIE so perhaps a little caution, ive heard medentry is decent from many people though.
[I know nothing about NIE I'm solely judging on what I've read in this thread.]
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Edit: The way i see it, personally, is you just can not improve that much on
section 1 or 2. Any half decent UMAT prep program would be able to give you a good idea of those kind of questions and prepare you for the UMAT so you don't show up and suddenly go into a panic.
What i'm looking for (yes, i still haven't signed up, im doing it this week) in a UMAT prep program is the section 3 content and the
quality of the lectures.
As far as I'm aware, MedEntry has some kind of section 3 generator program, which will generate an unlimited number of problems. This seems advantageous, since i believe section 3 is the easiest to improve on. If you do enough of them im sure you'll just be able to look at them and almost immediately see the answer.
However, the strategies provided in the NIE books sound promising:
"Define components of understanding: psychology, emotions, feelings and empathy.
Provide a strategy for ethical decision making." "Outline academic understanding of the Argument, the Question and the Answers.
Define the different types of Logical Reasoning questions."They are trying to sell you something though and perhaps these strategies come down to common sense but who really knows.
(I started out trying to prove MedEntry was the better choice... now im back to both being equal

)