IXL is the worst website to possibly use in school. It's "Smart Score" system is not at all smart, quite frankly it is rigged. You can answer 15 questions to get up to an 85, then drop down 20 points because of a single wrong answer. And a note to parents and teachers: Do not put your kids through this, Districts across the United States have had to replace devices because of kids raging while doing IXL.