I studied less than a month before I took the test. About 4 hours a day, 4 or 5 days a week for 3 weeks or so. I definitely don't recommend this, my plan was to study for about 2 months but I was so caught up in the end of the semester and all my schoolwork that I ended up not having as much time as I would have liked. (Note: do not schedule OAT for 2 weeks after finals!) I got a 350 AA 360 TS.