This is getting far afield from the original topic, but…
It’s actually pretty common for lawyers to specialize in one aspect of the law. (Real estate, wills/probate, liability, etc.) A lawyer who specializes in education law will be suing school districts just based on the choice of specialty.
Sadly, IDEA is a terribly underfunded mandate. The law says disabled students will get a free and appropriate public education, but when school budgets say otherwise it often winds up in the courts, which helps no one (except the lawyers).