Since you stated FAA written, i will assume you are taking the FAA course. First of all you need to study for it. I found the ASA cd based program one of the best. It will not only get you all the information and answers but also get you use to the FAA written test program. As for testing, it is now done by outside vendors like CATS (
Computer Assisted Testing Service) for a local testing site.
As for medical, go to the FAA website (
FAA: Home) to get the requirements for the medical. As long as your vision is corrected to at least 20/20 you are OK. If you are thinking of going beyond the PPL, I would think about getting a second or first class medical. That way you will know if you have any issues that would prevent you from your goal.