20

How about Two x Ten = 20?

I have a question for you all, hoping that you may shed some light on my problem. I am currently in medical school, and I want to improve my studying. Here's my situation. There are alot of diseases that I want to be familiar with. Each has its own symptoms/signs. How can I improve my skill at associating a disease to the symptoms/signs when they are presented to me? For example, if a patient comes with a particular rash on the face for 3 days duration with a fever of 102 degree and some other unique symptoms. How can I train myself to associate those unique symptoms to some possible diseases? Please advise.