
Ammon B. answered 03/14/19
Elite-trained GMAT Tutor (780)
Hello Kameron--I always recommend the Official GMAT Guide published by the creators of the GMAT, which you can purchase on MBA.com, Amazon, Barnes & Noble, etc. Because these materials are created by the creators of the GMAT, they are they closest approximation to questions you'll see on your exam. In fact, the questions in the books come directly from former GMAT exams, so somebody had to answer those same questions in order to get their score.
The questions in the book go by order of difficulty, so I'd recommend going through the questions until you've gotten to a point where you're not answering them correctly and then focus on that area.
The online materials available on MBA.com are also very helpful since they are also created by the writers of the GMAT and they have the same interface as the exam, so on test day, you're not surprised by anything.
Hope that helps.