A broad range of factors go into weighing how well the nation's schools are living up to their responsibility to ensure that students are on track academically and prepared to take their place in a complex, ever-changing society. This third and final installment of "Quality Counts 2018" digs deeply into test scores, high school…

States are grappling with a federal requirement that is forcing them to use a new, more uniform method of calculating high school graduation rates--a method that, in some states, is yielding rates that are 20 percentage points lower than those states have reported in the past. Under a 2008 update to federal education rules, the states were…