This is a good question. Being a good student just doesn't happen, it's an active process. Here is what I teach my students:
1. Prepare for class - Do your homework and review your notes. Then, spend a few minutes going over what you're planning on learning that day.
2. Seat - Your seat is everything. Sit in the front of the class so you can make eye contact with the instructor. It's easier to doze off or day dream when you know no one is watching.
3. Take Ownership of the Topic - You may not love what you're learning every day, but take ownership over it and fake it if you don't. Pretend like every lesson is your favorite, and every topic discussed in class interests you.
4. Listen - Listen as the teacher is talking and truly think about what you're hearing. Think about the topic as you hear it, and how it relates to what you already know.
5. Take notes - Find what kind of note taking works for you, and take them. Seriously, I take notes at all my meetings, though I will throw them away half the time. Taking notes helps me organize information in my head and helps me contextualize the information I'm hearing.
6. Remember why you're there - You're in school to learn, and that should be your ultimate goal. You're in EMT class to be an EMT. Do whatever you have to do to get there. If you have to fake being a good student until it comes naturally, do it.
Good luck, I hope that helps.