Anonymous wrote:
I think it’s easier to be admitted in middle school. This year applications to the top privates for high school were very high.
I'm not sure if there are any data to support that first statement, but it does not match my experience over the past 15+ years. Put simply, it depends on the school and the year. When I worked at a PK–8, more than 90% of our ninth-grade applicants matriculated at their first- or second-choice schools. I never kept actual stats on applicants out of our school to 6 and 7 elsewhere, but I'd guess their admit rate was in the 33–50% range.
There are usually far more spots open for 9 than for 7, so it's obviously the ratio, rather than the numbers, that's important. Given the number of public school kids applying for 6 and 7, many schools would admit a promising student who doesn't have great middle school options over a student who is already enrolled at a perfectly good school, but whose family is considering a change for non-urgent reasons.
Applying to eighth grade is usually dicier than 6 or 7 (it's asking a student to make a transition IN and OUT during the same year), but occasionally it works. I worked with two eighth grade applicants to highly competitive schools last year, and while some schools said they simply didn't have any spots (and thus didn't even read applications), both applicants were offered admission at great places.
In my experience, there's no single reliable answer to the question of which grades are "easier" to get into.