You must contact the jurisdiction in which those lights are and bring a complaint forward to the zoning or planning board asking that those lights be dimmed or they pay for the light issues they are causing to your property.  You can also talk to your representatives about the matter and see if they can contact their representatives in the adjacent jurisdiction to discuss solutions.  The other route is to obtain a land use attorney to file a lawsuit in civil court regarding this matter or to enter into negotiations with this school to resolve it before the lawsuit is filed.  There just may an ordinance they are violating when the lights interfere with your quiet peace and enjoyment of your property; it may even be considered a nuisance in your town.