The Ga. Senate has passed legislation that would give grades to schools based on how their students perform. Senate Bill 410 passed 38 13 on Monday. It is now expected to pass in the House. Senate President Pro Tem Tommie Williams, the lead sponsor on the bill, said the system would give a clear idea of how schools are doing. It would also create incentives for schools to improve performance. The grading system would tie into the state’s recently approved federal waiver from the No Child Left Behind law. Critics say the bill ignores subgroups like minority and special needs students.