Tojam

I think I'm wasting my time. The thing is, I was never good at science (biology & chemistry) as I thought I was. I took an Intro to Biology course last year at my community college as it was required to get into A&P, but I barely passed with a C. Then I failed chemistry but it was not required which dropped my gpa down to 2.8. As for my application, my gpa right now is 3.4 but I heard I need a 3.7+ to get in. It's really bad because I already forgot everything I learned in Biology, and so I was lost during my A&P lecture and I just could not understand anything my instructor was teaching. Should I drop A&P if I have no clue on chemistry and biology subjects? Or should the textbook cover over the basics at least for the first chapter? This year I have to make sure I get all A's at A&P I,II,III and electives. I don't know what to do. I'm 19 and this is my second year at college and now I'm thinking maybe this isn't the right career to choose. Thanks