No BGO required last I heard. Fact is, most BGOs have nothing to add over interviews from people in your chain of command, and your CO is senior to most BGOs.
Last year 50 Enlisted were admitted, only 4 from USMC. Looking back over the years, it runs from 50-75.
Last cycle middle 50th percentile in verbal ran in the range of 630-760 and 620-760 for math. That is the entire class. I expect they give the guys in the fleet a bit of a break. Your math score is very good. Still, I'd retake the SAT, or try the ACT. The test are different. They will take the best score in any of the categories and mix between tests regardless of when you took it. You can't lose by retaking. Since you have a 770 in math, study up for the verbal and don't sweat the math. Gamesmanship

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Good luck. Always love it when we grow our own.
Thanks for your reply and it helps me a lot. I knew 7 of 50 were directly from fleet and I'm hitting 23 next Nov so i'm looking for a direct appointment. Reading has always been my headache since moved to the USA but i will try to get that verbal up. Register another test in DEC. Wish me luck lol.