They do offer "Basic Composition" and "Precalculus" during the summer session. So, if you do get placed into those courses, I would suggest you take them in the summer if you can.
Actually, if you get placed into precalculus, I highly suggest you take it at a local community college or something. Precalculus here at Rutgers is brutal if you're not so strong in math.
I don't think it is so much about graduating in 5 years rather than 4, but you'll just be behind in taking science courses since you need calculus.