OSU encouraged my daughter to take the tests as late as the December sittings because those results would be updated in their system. Even if she was already admitted by then because they would use the best scores to determine merit aid. Scores after the December tests would not make a difference because they would be too late for the merit consideration process but would be recorded in student files. My S is taking in October and may take again in December depending on score. Definitely try to get one more test in whether that is November or December.