Decline in the freedom of claims class without driving

Hello! I have a question about the freedom of damage classes and I have just grown up, but I already made my driver’s license shortly before my 17th birthday. Since I am going to study now and will probably not need a car at this time, I have considered whether I could still sink in the SF with the following plan: I buy some car that just came through the Tüv and then register it, but only hire it somewhere off oh The idea behind this is the following: When I’m finished studying in six years and I can buy a good car, I don’t want to pay 120-150% insurance. Now I’d like to hear your thoughts about whether I might not have thought of anything and what you think about it in general. Mfg