using lsat rc’s for improving upon gmat rc is debatable. some experts are totally for it, and some against it on this forum. i think that if you have exhausted all the gmat official rc’s, understand how these lsat and gre one’s may be different from the gmat one’s, and still need more practice, then working through lsat ones should be helpful. however, just ‘going through’ as many rc’s as possible is inefficient. with each passage, your objective should be to unlearn your bad reading habits - including skimming and re-reading, - and improve on your reading speed without compromising on comprehension. i know it’s easier said than done 🙂