I'm working on a longer gouge post, but for now I saw your past posts said you mainly needed to work on your PBM part. The best thing for me was what everyone else did. Just buying an X52 and practicing on Jantzen's. You can just return it after the test. I would do the second highest difficulty, and have the ASTB prep app dichotic listening going at the same time (the Jantzen listening is not like the test). Putting the audio on fast, and intervals to 0.5 got me well prepared. The app doesn't switch the target ear, so I would just wait until 30 seconds left and switch the ear I was listening too. I think I averaged like 150-170 on the Jantzen side, and I would always make sure to get 95% or up on the dichotic listening (since its the most important on the test). I also ran through the emergency scenarios on Jantzen a few times, its very similar to the real test. Just make sure you write the scenarios down, and I propped mine up infront of the monitor during the test so I didn't have to look down or away from the screen. For the UAV I bought the TBAS study pro game on steam. Thanks to Szalona who told me it was pretty much an exact copy of the test, it was. If you need to improve the UAV score I would suggest you just buy that game. It functions the same way as the Prep App, but I think the visuals looking the same as the test helped me.
If you feel you need more time I would say just push it out a couple weeks or a month (I rescheduled mine). Especially since its your last attempt. If you have any other questions you can message me. I'm at work right now, but i'll answer everything when I get out.