EFC is an estimate of the lowest amount that you will be expected to pay. It’s not a guarantee. You should have checked NPC (Net Price Calculator) for a better estimate.
You are a transfer student. Transfers typically don’t get much when they transfer.
I don’t think doing research about the BU budget is going to move the financial aid needle.
The FA office creates a budget for each student’s 4 year plan. Most of the funding is used to attract the Freshman class of athletes, artists, NM scholars and desired underrepresented students. The money “runs out”.
Also, does that include your estimates for living on campus? Living off campus, in Boston, is very expensive. You shouldn’t expect the school to supplement the rents in a high cost of living area.
I agree with @thumper1 to finish your degree at GW and save your cash.
STEM candidates can find jobs anywhere. It’s you, as the student who needs to be resourceful. The name and the prestige of the school doesn’t matter. If you’re going to an expensive school like BU, expect to pay their fees. They don’t guarantee to meet your costs.