I heard the boards are occurring every month. Basically, when the board gets "X-amount" of packages in, they'll hold a selection board.
I hope you have a lot of Avionics Management background? (i.e. Work center Sup, CDI, etc.) The board looks for that. To get an edge, make sure you enroll for a Master's program. A BS is the min. Req'ment. The board is looking for people who go above and beyond! Trust me, I ran into the two CAPT's who were on my board and they told me why I was picked above all others. Make sure all of you "i's" are dotted and "t's" crossed on all of your paper work. Make sure you have everything! Don't send an incomplete package, regardless of whatever your recruiter tells you. It would suck to send it up incomplete and find out two months later that’s why you weren't selected because of that reason. I posted a lot of Info. On this space in other places, check out my postings, about the AMDO stuff, just do a search. Just make sure you have awesome write ups! If there not "10's" or "outstanding" don’t include them. Get as many character references (O-4 and above) as possible; you can never have enough good things said about you. Make sure most of them are from the 15XX community.
Good Luck!