You get granted a certifcate though, by applying to work at a school as a sub. So, like I say, all you need are 60 college credits, Assoc. degree, Mantoux test, fingerprinting. The best thing to do if you're interested is just pick up an application for it, at the school you think you would like to work at, and talk with the person that gives you it. Ask if everything you need to clear is inside the application.. like the form for the Mantoux results, and fingerprinting, and should you bring in the college transcript, or have the transcript mailed to them. When that's taken care of, you turn in the finished application. The way I'm pretty sure it works is, they then get the certificate for you, through the State, after you pay the fee for it. What you looking at is, like 3 fees. Fee for the Mantoux, fee for the fingerprinting, fee for the processing. But, it's not like you have to take special courses and whatnot.. unless that particular school for some reason wants the subs too. Otherwise, that's all that's needed. Just the formalities.