well, i solved the LSAT CR and RC for the first time i took GMAT. what i feel is that the answers have a pattern in LSAT. in one reading you can identify the correct answer, but in GMAT, the CR's answer choices are somewhat vague. sometime you may get lost, however you have to choose one answer from them. may be i am wrong. but, after coming from test center for the first time, i felt that if i want to sit for GMAT i should practise GMAT question not anyother.