I meant the Exam Pack from GMAC. It includes two tests, GMAT Prep 3 and 4.
You can purchase it here.
https://www.mba.com/us/store/store-catal ... ack-1.aspx
You have plenty of practice tests. I am merely saying that if you want to take more official tests, you could get more by purchasing the the Exam Pack.
In order to score over 550, probably you should go over your tests and find things that you could be doing better, and then between tests focus on getting better at those things.
For one thing, you could use the Manhattan analytics to get a sense of what types of questions you are missing. Then you could focus on learning about and practicing handling those types.
Basically to score 550, you need to get right about five to ten more questions than you have been. So by focusing on say five to ten types of questions between now and when you take the test, you could set yourself up to get enough more right answers to score 550.
Much of the value of the practice tests lies in guidance you can get from the results. By seeing what you did, you can determine what you have to work on in order to score higher.
To focus on verbal question types, you could use the Veritas Question Bank.
To focus on quant question types, you could go to the GMAT area here,
https://bellcurves.com, sign up for a practice account, and go to the quant part of the question bank and do questions by category.
When you take practice tests, you are doing the questions on a timed basis, which does not give you much of a chance to develop hacking skills or other skills necessary for getting right answers. So for a different kind of training, do the practice questions more slowly and carefully, emphasizing learning how to get right answers consistently.
If you were to use the Veritas questions to improve the processes you use when doing verbal questions, you would probably get at least 3 to 5 more right answers to verbal questions, and by doing question type focused work in quant, you could train to get more right answers in the quant section. So by doing those things, in addition to continuing to take practice tests, potentially you could drive your score up to or above 550.
Probably, also you could get some points just by improving the accuracy of what you are doing. I mean in addition to learning some new ways to handle things, you could work on becoming more accurate in doing what you already know how to do.
