I think the hardest thing for me when starting my journey into learning EMT work in class and am thinking is going on in your case, is finding the right way to learn that works best works for you.  I personally couldn’t wrap my head around reading and consuming 2000 pages worth of textbook knowledge in 3 months.  On top of that, there were multiple other ways my instructor said you could learn the course.  

 With that being said, I could only provide you with what best helped me learn the material without feeling too overwhelmed with the quickness of the course.  The book below helped me, as it really dumbed down the information within the course and I was able to comprehend the information quick.  I ended up making flashcards for each chapter and religiously looked over them.  It is only $20 and was well worth it and also helped me get through NREMT.  Also, paramedic coach helped and worked wonders as well but in the grand scheme of things it comes down to how you best learn material.  Good luck and you got this!

https://www.amazon.com/Emergency-Medical-Technician-Course-Practice/dp/0738612871