If you would like to work in such an urgent area of medicine as public health, then I highly recommend you pay attention to the information that you can find on this page, dig this. Of course, you need to get a specialized education. If you are weak in writing text assignments, then it is likely that you will have difficulties with such a paper as the public health statement of purpose. Without this paper, you will not be accepted in any university, college, or specialized school. Please follow the link I left above. This may be useful for you!