<p>There is absolutely NOTHING for you to be worrying about. Getting Bs will not effect you in anyway whatsoever. Placement is determined by tests you can optionally take to be placed into an advanced section of a course or pass out all together. There will be no repercussions whatsoever… and seriously, repercussions over Bs? You need to chill out, enjoy your last summer before college (even if you are working, I worked too last summer) and just relax! Seriously you will be fine. 
Please, please, please do not stress out so much! And please don’t freak out about grades when you get here! That is seriously one of the worst things you could do!</p>