The Trico has several legal casebooks that summarize educational policy cases. Below are some recent titles available in Tripod. There are others (both older and recent) that you may be able to request from Bryn Mawr or Haverford. For a list, see the Educational law and legislation -- United States -- Cases subject heading in Tripod.
For more links to federal case law materials (i.e. beyond case summaries, things like court reports and transcripts), take a look at the US Judicial page of the SOWK 585 Legal Research course guide.