In my case, EMT school was easier than I thought. Then again, I wasn't your average EMT student. Most of what I'd learned in EMT school, I was already proficient in. I think I had to crack the book open only once or twice. Most of Paramedic school was the same way. Don't get me wrong. I did the work, took the exams, and so on. I ended up doing well on the NREMT-P exam.
However, many of my classmates (EMT and Paramedic schools) had trouble because they hadn't taken an A&P class. Not even a functional A&P class. That put them at a disadvantage, but they read the material, listened to the instructor, did the work. They passed. In my particular EMT class, out of about 25 students, 1 failed, 2 dropped. The ones that passed, did the work and did well. Same with my Paramedic class. The ones that did the work passed. 18 started, 14 finished.
Just about anyone can take the class and pass it if they do the work. Once you're done, if you can and have the time, I suggest you take some kind of formal college-level A&P class. It'll help you gain insights into what you're seeing when you work with patients and the problems they have and what needs to be done and why. If you can, take the full year of A&P. It'll be better and it'll be accepted as a prerequisite to many other healthcare programs.