They accept 14% because you have to meet the criteria for entry to the school- based on how much your family makes. MHS is a school that helps students coming from poverty with a goal to break the cycle.
“To be eligible for admission, children must attain a score of 80 or higher on an I.Q. test . In addition, applicants must have demonstrated capacity to learn”
This is from their website. If you are looking for a high rigor school take into consideration that the school requires students to have an IQ of a min of 80. This means that some students will be working on a less academically tough level than those of the toppy top BS.
Their mission is awesome.