Hello, I'm a mechanical engineering student, graduating next year. But I'm interested in getting a PhD in physics. I know this has been asked a lot, I read through ZapperZ's excellent essay on the subject, his post, and many other related threads. But I'm still somewhat confused. Now I know for a fact that I'm under prepared to go directly for graduate school in physics, and that i need extra courses, but now my question is, what should I do next? I'm confused between these three options; 1- Do a second Bachelors in physics (considering that it shouldn't take more than two years given my background) 2- Do a Masters first, then a PhD (terminal masters?) 3- Go straight for a PhD, if the university is welling to let me study a year or more before actually beginning. I'm referring here to the U.S. educational system, but advice on other countries' systems is welcome. Here are a few points to consider: - I have no research experience. - I wouldn't like to limit myself to any areas of physics as of now (something related to my Mech.E. for example). - I don't want to rush it, my physics education is very important to me. Also, do options 2 and 3 require me doing a GRE physics test, and take qualifying exams? or do I do that after finishing prerequisite courses?