A study by the National Education Association says Nevada ranks at the top for states with the largest average class sizes in the nation, for the second year in a row. The Las Vegas Review-Journal reports the data shows the state has added an average of seven students over the past three years. The Review-Journal also says some high school classes have up to 50 students in Clark County and the overflow problem foreshadows budget cuts in the school district. Officials there made additional budget cuts in May and advised the class sizes would grow.