Its actually benificial to rather get your International license from your original country (issued in yr original country to you), and then to come here and drive a few months with an International License. I am not sure if it depends on country-country, but I was issued with a one year International License (South Africa) and that you can obviously drive her ein Switzerland for one year with. before the year is over, you have to convert that license into a Swiss license.
You have to go to your license authority (swiss) and book an appointment, they will send you a letter stating the time and date of yr driving test. And...a few thinsg that you have to bring with for example...a stamped/signed eye test from a swiss optometrist. But the eye test is easy, walk into any optometrist and give them the paper that the license authority send to you, and they complete it and stamp it and also do a quick test. Does not cost much as far as I can remember. Also you need ID pics etc etc. Nothing strange there I guess in what you needed.
So, here is yr questions to yr answer:l
1) I think THINK you can drive 1 yr with a valid issued AA license, BUT..check on yr AA issued license or otherwise rather make sure and take a drive to yr local license authority. Its worth it, you do not want to end up on the wrong side of these things.
2) Yes, you have to give an eye test paper in, one that they would send you to have stamped and completed
3) I did not have to do a written exam/ test before the actual driving test. I think it might depend on yr AA license, and where you coem from...but I do not think that the US would be a problem.
4) Look at my answer at top, I think its beneficial. Especially good that you get to know the rules and roadsigns.
What I did, I took a friend with me to drive, and she woudl play the authority and direct me in driving where and when, and we drove around where the licensing place were...as you start obviously at license office and then have to go somewhere...so, take a drive there, ...on a quiet day, and just drive and test yourself, and notice things and check it out.
But, from all the posts here...you can read that most say that you should spend yr money and go and get a instructor to drive with you. TRUE...do that, its money worth spending, rather than to THINK you have th rule right, and then later are sorry to find out that the Swiss treats teh rule different etc.
Do not panic to much, I promise you also...if you are a confident driver and know your car and drive well, without any false starts and beginner things...that also helps. be confident, and try to be calm, he is only there to see if you CAN actually drive a car, obey rules and are not a hooligan on the road and will NOT endanger anyone. So, good luck, be yourself. When I got in teh car with teh authority, he told me very nicely that I should just drive like ai drive everyday and relax, as he is only looking if I can handle my car, the rules and be on the road legally! I hope that you also get a nice guy..