Does anyone know if specializing after medical school is challenging? Say I get my MD Degree, then I want to become a Medical Oncologist, is it very competitive to get into an American university for that, or is it already much easier since there's not many doctor's in the states?
Well, you don't specialize in oncology right after you graduate from medical school. In the US, this is how it works:
4 years of university training
4 years of medical school
After medical school, you decide what you want to train in. You can train in surgery, pediatrics, neurology, internal medicine, etc. You will train in your chosen field for 3-6 years. (You will receive a salary during your training period.) If you want to become an oncologist, you must choose to train in internal medicine.
In certain medical fields, after finishing your training, you can then decide if you want to "sub-specialize." This is when you focus on oncology, and finish the last step towards becoming a medical oncologist. This additional training is usually 3 years.
It is not easy to get a training spot in an American hospital if you're not from this country. There are a lot of doctors in the US, and preference usually goes to people who have graduated from American medical schools. If you want to train in America, it requires a lot of planning on your part, but it is definitely possible.