If you payed attention and didn't cheat your way through undergrad, then you should be able to remember the stuff when the professors talk about it. If they professors say something and you don't remember it, write down what you don't remember, then go look it up when class is over. For the love of god, please do not stop pharmacy school professors to explain stuff that was supposed to be covered in prerequisites. Go home and find it out for yourself.
Don't waste your last summer before pharmacy school studying. Seriously, assuming that you are going to get a job right after you graduate pharmacy school, the summer before pharmacy school is going to be your last summer of freedom. (Unless you spend the 3 months after graduating partying and then start working in September.)