If you are a teacher, Easy Grade is for you. If you know a teacher, you can help them out by telling them about Easy Grade.
Easy Grade is a free iOS/Android app that gives teachers the ability to quickly calculate grades on their students’ tests and quizzes. Configuring it is super-simple. It lets you calculate grades based on the number of questions right or wrong. You can show grades rounded to whole numbers or tenths. If you give partial credit, you can calculate grades based on half-points as well (available via In-App Purchase).