Hi, please don't worry too much about your speaking exam. I haven't done mine yet - im doing it june/july after exams, but i have done some practices and ik how u feel. i just like to remember that im not gonna be the only one doing it and everyone will probably forget about it anyway. Personally i only remember the really good speeches. If u say something wrong, its fine, it'll happen to most people anyway, but if ur really worried maybe just try laugh it off or something.
Hope this helps!