When I began studying for the LSAT I purchased two official LSAT "packs" that included LSAT's from June 1996 (when I was born) until October 2002 because they were cheaper than buying the more recent ones individually. I know that some of the old tests featured more frequent questions types that are perhaps less common, but what else? When I watched video explanations for some of the games JY would begin to talk about the format of the game and say something along the lines of "well this was a game from 97" as if its been phased out.
Any help would be much appreciated :)