I have been studying lsat questions. Here are my observations sofar. If you are using the real lsats. there are about 25-26 cr's per section. The first half of the cr's are easier than the latter half. Lsat Cr has question types that are not really tested on teh gmat such as "what is the flaw of the argument", "what closely resembles the argument structure" and some other weird ones. The lsat does not place heavy emphasis on the strengthening/weakening/inference types that the gmat does. In my opinion, the strengthening/weakening/inference types in the og are more difficult than the lsat ones of the same type. ALso they are in a slightly different format. That being said, if you have ran out of reliable material, i think the lsat stuff is second best to official gmat stuff.