The practice tests and the actual test are exactly the same. The way the questions read may differ slightly, but the concept behind the question is the same.
My scores on all of them (on the practice tests) were nearly perfect. Delta doesn’t tell you what portions of the test you flunked just “better luck next time.” Maybe it’s changed as I haven’t tested since 2019 and I’m finally at an airline I want to be at so I doubt I will be testing again there. Plus I’ve failed out 3 times, and unless things have changed, 3 strikes and you’re out.