JetBlue,
My friend, you are in an extremely favourable position in comparison to 98% of the posters on this mammoth double thread which goes back as far as 2001 or so...
This is because you have a shot at the light gun test...There are loads of things you can do to prepare for that....head down to some airports, maybe make a call to an ATC tower and be polite and explain your situation, and ask if they'd possibly give you an example of the lights.
There are even some clips of the lights on youtube...you also have an opportunity to try the other forms of tests first...do as much research on all of these tests, and understand how they work etc....
Do your absolute best and make sure you get through this...you have an INCREDBILE opportunity, make sure you make good use of it...
Fail the tests here, then thats it, end of the line.
Do your best, you can make it.