gmat official guide verbal review book pdf: tinyurl.com/2p875wf8
the best practice material, of course, is the official release. these provide sample questions that perfectly match the difficulty level and the style of the official exam, here: tinyurl.com/4s39u4za
gmat club will be tremendous help to you in this journey: tinyurl.com/2jz8yjkk
hult has great online simulation tests. even though they are a bit easier than the official ones, it is good for starting: tinyurl.com/4mawr6st
for the sentence correction questions in the verbal section, definitely use #college-panda to prepare. it is the best resource if you are in need of improving in this area. and after that, lots of practice from official books of course.