Scoilnet, the Department of Education and Skills official portal for Irish education, provide a quiz portal where you can create and share multiple choice quizzes relevant to content for both the Primary and PostPrimary sectors.
Feedback is given either as you go through the quiz or in one go at the end.
You can search for quizzes via subject name or tag. I suppose post leaving cert content could be included in the post primary section though it may be better placed in a section on its own!
Here's a little Database quiz for you to try!