BS take a lot of work and planning so 7th grade is not too early to be considering schools. But rather than thinking about Exeter, consider the large range of school available. It is too soon to
I know if testing will be required next year. Most domestic students could take the test this year and I would guess that it will be required.
Congratulations on you high MAP score. (But just say 99%, there is nothing higher) Do not assume that a high score on MAP will directly translate to a high score on another test. Taking a sample SSAT is very helpful and probably many tutors in your area offer them for free. It is important to understand the pool of applicants is different and more competitive sometime your scores aren’t what you are expecting. Just as a comparison, my son had 99% in all areas of the MAP for several years but still had to hustle to get his SSAT that high.