Will let you add on additional certifications just by passing their state mandated test? (i.e. The Praxis) In Ohio you have to go back to college and take the classes required AND pass the Praxis in order to add on additional certifications. Can anyone tell me what states you know of where you can be certified in one subject and just pass a test to gain additional certification. Please don't misunderstand when I say "just pass a test." I know the tests are difficult. The difference between spending a few hundred dollars on the test compared to thousands at a college/university is mind-boggling to me. Thanks!!