It is mandatory for an MBBS student to complete his PG to set up a clinic of his own or any other plan these days. The knowledge acquired during your education tenure will be enough to Crack through PG entrance during your first attempt.
Internship. According to my seniors I didn't enter my internship is a tough job at osmania hospital as there will be many many many patients. But you will receive vast knowledge during your Internship.
As this is medicine all the students would love to write PG exams and then go looking for jobs.
At present I am a 2nd year student and not yet done my internship. But according to my seniors internship is time when we can have lot of exposure to knowledge.