Please take a moment and update your account profile. If you have an updated account profile with basic information on why you are on Air Warriors it will help other people respond to your posts. How do you update your profile you ask?
Depends on the recruiter. You don't have to take it til after Pro-rec, but some recruiters want you to get it out of the way earlier. My recruiter isn't making me take it until after.
It is command dependent. Weather plays a big part of the when. Most commands I have been in take it in MAR/APR and SEP/OCT. There are other timing requirements as well. See here...
Oh I'm sorry, I hope I didn't misunderstand your question. I assumed that you meant the PRT one takes during the application process. I can't speak to PRTs taken once in the fleet, as I am not there yet.
That's recruiter dependent. I had to take mine twice because I didn't pass the run the first time. However I will tell you that I ended up taking my PRT towards the end of my application process. After I was physically qualified I took my PRT. Just be ready to take it whenever because you can't be sure when they'll ask you too.