The web gives you a ton to work with here. One of the best ways to gauge the fit for your firm is to have some of your employees take the testing first and see how they score. This will set the benchmark for candidates, as well as tell you if the test is covering the areas key and critical for your business. Take into account ease of accessibility, the time it takes to complete and the way the results are delivered as well. You want something that provides an easy to follow yet comprehensive view on the results.