While I would advise against practicing with GMAT tests that are not official (the questions and formats are not standardized and do not give you an accurate idea of where you stand), a lot of people have asked for free resources for GMAT practice. Here’s a list I had compiled when I was preparing for GMAT:
OFFICIAL: GMAT Test Prep Software:
You get 2 full-length GMAT practise tests with real GMAT questions. This test will closely mirror the actual score you will get in the GMAT exam.
Manhattan GMAT:One test is free, you will have to pay to access the other 5 tests.)
Economist GMAT –
Studycopter: Studycopter GMAT Tests (I personally haven’t tried out these tests, but they seem helpful and close to the actual GMAT test format)
Free GMAT Tests offered by Business Schools
Hope this helps you in your preparation for GMAT. If you come across any other free GMAT tests or if any links are broken in the above list, do leave a comment and let me know so that I can keep this post updated!