Failing on purpose an oral exam I am not well enough prepared for an oral exam I will have soon. I should probably pass the exam but with a bad grade I wouldn't be happy with. This comes due to some bad time management and some personal problems during the semester. Unfortunately I still decided to take the exam....

Since we have 2 tries I am planning to fail it. Now I am unsure how to do it politely. Is it ok to come by and see how the exam is, but answer bad on purpose or should I sent a mail that I'm not well prepared and apologize and come to the retake date?

I'm grateful for any advice how to handle the situation.
Don't waste other's people time, and be respectful to your professor and to your fellow students as well. Send an email and apologize: the time slot allotted for you can be better used in another ways, e.g. to improve other students' exam schedule.