Practice practice practice. My only advice is to really zoom in on the words and make sure not to miss a slight nuance that changes the meaning. Also, to get a higher score, you will need to infer the meaning of words you don't know by the context of the rest of the sentence and if not, move on! Don't get stuck on one word as the LNAT is all about speed! At the end of the day, there are plenty of amazing unis that don't need the LNAT so all you can do is try your best! Work hard and practice and you will go far! Good luck