Just a FYI on the high schools...

When people here magnet schools by admissions, they tend to think of hyper competitive magnet schools like Thomas Jefferson in Fairfax County or Hunter or Stuyvesant in NYC. The formal cutoff for City is 65th percentile on nationally normed standardized tests and successful grades in middle school. Students of educated parents who are spending time researching schools will most often have test scores in the 65th percentile. At a school like Stuyvesant you are looking at 95th+ percentile of those who take the test for magnet schools.

Baltimore School for the Arts is by artistic potential.

But for the most part if you are in a good elementary/middle district your student will be able to go to one of the good public high schools