Having used the FA calculator myself, I can tell you that it is very unlikely you will get much financial aid, unless there are other aspects of your parent’s financial situation you haven’t disclosed. Also Andover is not need blind for FA, it is need blind for admissions; they don’t look at whether you need FA when determining whether to admit you, but they do most certainly look at whether you need FA before they give you any.
There are, unfortunately, very few merit scholarships for private school. I know that Peddie has a couple. Maybe some other schools do as well.