That Quiz is simple but effective – all free and no adverts.
Quizzes are available on a variety of topics, teachers can register and add classes if they wish. It took me moments to create an assignment for my Year 7 class on directed numbers.
For an alternative way to set up a simple quiz try Testmoz. No registration is required. This has been written by Matt Johnson, an undergraduate student – the instructions are all very clear and you can check out the FAQ! (I love those FAQ! For example: I lost my quiz URL can you retrieve it for me? Answer: No).