I don't believe they used an approved practice test. It is useful for going through the process of sitting at a desk with numerous other students around you taking a timed test so you get use to the environment. If they used an approved test they would likely have to charge for it because there would be copyright issues
I've taken a practice LSAT at my University offered by Kaplan. For me they gave me the option of giving me the June 2007 (free to everyone) or bringing in your own exam. I think it can be useful. Sitting at home or a library with the proctor app, while it is certainly useful, it does not give you the REAL deal. Having a person sitting at the front of the class, as well as having other students surrounding you gives your PT more authenticity. I don't think there is any harm done in foregoing such an opportunity, but there can be some value to giving it a try. For me, just getting a closer look and feel for what test day might ACTUALLY feel like helped alleviate a little bit nerves that sat in the back of my mind.
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If they used an approved test they would likely have to charge for it because there would be copyright issues