Actually medical terms are usually not English , I mean the English language you learn in intrernt or institute or English learning centers won't help a lot , because what they focus on is how to deal with people in regular situations , but what you learn in medicine is different . So my advice to you is just study it step by step and don't be sad at all , the greatest doctors started from zero to, all what you need is to study again and again and to translate the terms or words that you don't understand , then after a while you will see yourself able to study it without dictionary. Step by step and wish you all the best