Hello, I' m Sheawj's medical half. I'm in 4th Year (4 out of 6 or 7, counting internship)
I don't know if you're planning on going to UBA or to one of the private ones :Barceló, UCA hmmm... I' m not too familiar with private schools actually. The good thing about the private ones is that you get to go to the hospital from 1st year, although from what I heard, you don't get to do much. No idea about their tuition fees. As for UBA, to get into the school I know you have to pass some sort of Spanish test and you might need a bit more of paperwork (I was trying to post it but my computer is working slow and funky, but type in Google Resolución N º 1523/90 del Ministerio de Educación, Ciencia y Tecnología and it might say what you require to enter UBA. After all your paperwork is done you will need to the the CBC, you' ll be taking a bunch of basic subjects (chemistry, math, biophysics, cellular biology, epistemology and Argentine history) with a bunch of other students from different careers. Once that is completed you enter Medical school. The first three years you see basic medical subjects (Anatomy, physiology, etc) all your classes are in medical school and you see no patients. In 4th year you get a hospital assigned and then you go there every day for the clinical subjects. Once you complete all your subjects you do a year of internship (IAR) where apparently... you don't do much, you rotate in various hospitals but sometimes you just sit and see what the Dr is doing and that's it. It depends a lot on yourself and the hospital.
Also, if you are willing to work for free, there is a lot of things you will be able to do with no problems and depending on what it is, not much competition: do research, teach classes (of course you' ll have to pass a test and go a semester to teaching school for this), help in the ER of a hospital (specially South of Bs As)
Any other concerns just ask me.
Good luck!