Just a suggestion..might be worth it to do a test drive at your actual testing center, not all testing centers are the same. While at the test center you can get all your questions answered and actually take a mock test on the computer(not a DAT test). You can work with the calculator, the mouse, see the computer screen, etc.
By taking a test drive it often relieves anxiety that you might experience on test day.
https://www.prometric.com/en-us/for-test-takers/prepare-for-test-day/pages/take-a-practice-test.aspx
Just my 2 cents
Nancy