TO a certain extent, it is. Physics is one of the basic fundamentals to human physiology. Though I would doubt any sane medical school would test it to a great deal. You can drop it in lieu of Bio (assuming the other two subjects should be Chem and Maths). I have plenty of friends who did so and managed to get into medicine. However, Physics will give you a better edge if you score, it looks a lot nicer of 4 flats than 3As. During the 7 months you have, what to do is entirely up to you. You could do all of those you suggested as above. You could get a job or something. It's entirely up to you. Work experience in hospitals is not as "work" per se. If you do not have a background of basic medical knowledge, I highly doubt that it'll help much, it'll open your eyes towards the life of a doctor, certainly.

well, i'm guessing you like the physiology and biochem parts of biology. as you may have already noticed in A2 you'll learn the bigger aspects of biology like natural selection, biodiversity, crop plants, etc which has near NOTHING to do with medicine. but its good that you like biology, which probably means you like reading and you are looking for a career which involves life long learning. what your teacher says isnt actually true, i know plenty of medical students who took bio chem maths and for their fourth subject they take either psychology, economics (me included), english literature and to a certain extent history or accounting. but there is no doubt a sound foundation in physics would help in the long term later on in your pre-clinical years.

its quite difficult to get work experience here in malaysia for medical students, it'll take a looooong time for you to get a placement if you use the proper way of sending a formal letter to a government hospital. private hospitals are too tedious when it comes to protocols. i did mine in a government hospital in a rural part of town, they've been known to be more cooperative. it also helps if you already know a doctor, that way you could just ask him/her to settle a placement so you wont have to wait so long. its better to do your work experience at a hospital than at a clinic, you'll get to see a wider variety of cases (depends on which ward you are attached to) and you will get to experience the ever tiring life of a doctor.