I used this video. https://www.youtube.com/watch?v=Nyi8DrAuBJ8 Made it easy to do the spatial orientation rapid fire. A few pieces of tape will help with the inverted compass rose. (Don't cover the webcam!)

I used Pilotassessmentprep. $24 is the cheapest thing you can buy in the interview process. I practiced on both laptop and ipad and ultimately took the DAL test on the ipad because you can use 2 hands on the "3 things at once" test. Use your left hand to land the plane and your right on the math and letter problems.

While the software covers 3 of the 4 skill tests with DAL, AA gave me 9 tests, 8 of which were covered. So yeah, absolutely worth it to practice and get the confidence.