Two Republican-backed bills introduced Wednesday in the Nevada Senate seek to impose new education reforms affecting under-performing schools and teacher layoffs. SB195, sponsored by Senate Minority Leader Michael Roberson, R-Las Vegas, would allow parents of students in under-performing schools to petition the school board to make specific changes, including the governance structure.. SB193, sponsored by Sen. Greg Brower, R-Reno, would require school districts to consider the evaluations of teachers and administrators when determining layoffs and is an extension of reforms passed by the 2011 Legislature. One of those created a four-tier teacher and administrator evaluation system that replaced a two-tier …