Yes! Our Premium GMAT plan includes both practice tests created by Magoosh and discounts to official practice exams created by GMAC (makers of the GMAT).
Magoosh Practice Tests
Our full-length practice test questions are drawn from our general pool of 1250+ questions, so you can take about 2 full-length tests before you start to see repeats. We usually recommend only taking one and saving the other questions for more targeted practice. However, you're always free to reset your questions and keep taking practice tests as many times as you like!
You can learn more about our tests in this post on our GMAT blog.
GMAT Official Practice Exams
Everyone has access to two free GMAT Official Practice Exams, which are a great way to simulate an experience just like the actual GMAT.
Magoosh Premium students also have access to exclusive 40% discounts on the remaining four paid GMAT Official Practice Exams (exams 3 to 6) and also the two Official Practice Question banks. To purchase, log in to your Magoosh account and navigate to the "Official Practice" page in the "Resources" header dropdown menu.
If you haven't signed up for Magoosh yet, you can learn more about this discount here.
If you have any questions or are having trouble purchasing the discounted official practice materials, please email email@example.com.
Other Practice Tests
Next, here's a free test from Manhattan (their materials are great!): Manhattan Full GMAT Practice Test.
Another good way to get an additional practice test from Manhattan is to purchase one of their GMAT Strategy Guides: Manhattan GMAT Strategy Guides. Doing so grants you online access to the first exam in their set of six. However, if you have the desire, time, and funds for a large number of practice tests, a better deal might be to purchase online access to their full set of six exams: Manhattan GMAT Practice Tests.
Hope this helps! :)