I'm also searching for this.. It doesn't seem like one exists.
I'm taking a crack at creating one now.
With a daughter that is a Junior in High School, I'm following this thread closely to see if someone builds a connector. The data itself can be downloaded and utilized outside the api as well but the web data connector would be nice.
You should be able to steal my code for the King County restaurant inspection connector I wrote (benlower/tableau-wdc-kcfoodinspection · GitHub) It uses a very similar pattern. You will need to register for an API key for the ed.gov API and then change the URL in the KC connector code. You'll also want to change the HTML form to accept any inputs you may want to use for filtering (or just use a submit button to pull all their data).