Road to Grammar Jr is a site that has grammar quizzes, practice and games.
Their, there, and they're
Students can choose from over 300 grammar quizzes. This site is appropriate for all learners, but is geared towards grades 3rd - 8th. It is also appropriate for ELL/ESL learners. The quizzes provide instant feedback. If your answer is correct, there is a check mark, and if your answer is incorrect, there is an X. I did not see a way to print the quizzes when you are finished, but students could make a screen capture of the page or raise their hand for a teacher to check their score.
I would use the quizzes on this site for individual practice or as a way to introduce or review a grammar skill before or after a lesson. I like that the quizzes are short with only 10 questions.
Can I add that the quizzes called Spot the Mistakes are not easy! I found them very challenging!
In case you are wondering, there is a Road to Grammar for older students and adults. It can be found here. This site has more adult content and is not for young learners. I did find it to be engaging.