Perhaps, if you use a specific smell (perfume or cologne) while studying, that same smell used on the day of exam may increase your ability to recall information.
I'm not certain this would work, but I think it is worth a try. Just don't be overpowering with the cologne or perfume. You don't want to offend other test-takers or make it uncomfortable for people in the same review workshop. The exams are tough, and every little bit can certainly help. It just makes scents to give it a try. (pun intended)