An Act amending the act of March 10, 1949 (P.L.30, No.14), known as the Public School Code of 1949, in preliminary provisions, further providing for definitions; and, in school directors, further providing for school board in first class A school districts, apportionment of seats and numbers, terms and methods for election of school directors in first class A school districts, for number and election in districts of the second, third and fourth classes and terms of office, for number and election in districts third class and terms of office and for number and election in districts fourth class and terms of office.