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Yes, you do have to take a test called the Praxis. Since you already graduated with a business degree you can go back to school with something called an alternate route. This will only take a semester to do and then you will have to pass the practice and then you will become a certified teacher. It may seem like a pain to go back to school but there is really no way around it. You might be able to get a job in a high school as a business teacher while your doing the alternate route to become a middle school teacher. There are just some classes you have to take to teach a specific subject and of course the test. I hope this helps! Good Luck