Which subject SAT do I take and which books?

Hey so I’m a junior in high school and I wanna do chem engineering with focus on biology in college. I decided to take math level 2 and I’m not sure about which science subject SAT to take: Chem or Bio? I’d prefer bio but at the same time i know if i work hard enough i can manage chem. Would colleges prefer chem over bio as i wanna do chem engineering? And if it wouldn’t matter, should i take Bio E or Bio M? Also could you recommend any books for these? I’ve heard barrons is good? I probably have to self study