S.H.
In addition to what everyone else suggested below: It is not only the school, that makes the child.
And you need to think of the cost, and how that will impact your family long term.
Many people, if they choose to and per costs and if their child passes the interviews to enter into their private school of choice.... send their kids to private school, from about 4th grade.
Then, the school you are talking ab out, is in the PROCESS of becoming... a STEM school. They have not, gotten there yet. And this is only for 1st and 2nd grade. So then, what about 3rd and 4th and 5th grade etc.? What will you do, then?
How is the public school in your district?
It is also, about how parents also, help their child's learning, at home too and through your own enrichment that you provide for your child. Learning is not only done, at school.
Does that STEM school have financial aide? Scholarships? Grants for lower income kids/families?
That is a big chunk of change, to expend, if you can afford it.
If you cannot afford $12K per year, then the answer is: don't send you child there.
I know many people, who have sent their child to private school, taking on more than one job, to do so. For example. And their whole point of doing so, is so that they can send their child to a private school. BUT then, once their child graduates from the private school, the family is financially drained. And then, their high school graduate, has no money to go to college, out of State. To a "good" college. So then, the family/child has to get scholarships/grants or just go to their local university. Because, the family cannot afford, a "good" college anymore and all their money was used up, for "private" schools from elementary onward.
I also know many families/kids, who went to public school. And their children did well, and went on to universities like Harvard and Stanford and M.I.T. Because, they as a family, made sure that education and studying and their child's learning, was also.... supplemented by things they taught their children, outside of, school. And this was their focus. Their children were very educated, and sophisticated, even if from a public school..... and they were very "smart."