Assemblyman Fred W. Thiele Jr. of Sag Harbor has signed on as a co-sponsor of three bills aimed at updating and balancing the state’s system of designating money for schools, which were introduced by Assemblyman Nader J. Sayegh of Yonkers. “More and more demands are being placed on local school districts to meet higher standards. . . . To achieve better quality education for all, there must be adequate support from the state,” he said in a statement.