There are many resources on the web that will direct you to an Internal medicine course. This does not mean that you should ignore the rest but focus on internal medicine. Also do not get stuck with details. Try to get a good overview of things and strengthen concepts. Whenever you learn a fact, think out how you can apply it in different situations.
Exams are no longer fact tests.
They are based on application of facts. Internal Medicine forms the bulk of all the exams at that level. If you study it well, you should be on top of the lists. There are many resources on the web that will direct you to an Internal medicine course. This does not mean that you should ignore the rest but focus on internal medicine.