I think you'll be surprised on how adaptable you are once you start to see and understand "the type of learning" EMT class is. Like i said, i wasn't used to doing well in class, and when they said unless i maintained a %80 average in the class i had to make up my mind and realize i was going to have to adjust.
It might not be easy, but all i can say is give it all you've got and tell yourself "i'm going to be an EMT!!!"
Once you get it in your head that you want it, you'll seek out every possible way to remember that material. Figure out what works for you, and keep looking until you see the results on your test, and feel like you understand it.
Look online for study and retaining tips, figure out what will help you understand all the foreign information.
You might have to read things a few times to understand, because often times info is scattered out through the chapter, but in the end you will see it all "connects" and repeats itself.