Have a Unique Test ID when a test is created from the question set. Have a "Custom" test creation option where users can plug in a test ID and take the same test, so students studying in groups can take identical question blocks and review together.

If you could have a unique test ID generated when a test is created (with questions based off whatever filters were selected). The test ID would correspond to that exam with those exact question ID's, then have a "custom" test creation mode where users can input their own question ID's to take an exam from suggested questions (such as from a review group) and/or input a test ID so they can take a test that has been previously generated by someone else (such as a study partner, or study group leader). Then two people can take the same test at the same time and be able to review together.