Because BBS students come from a variety of academic backgrounds and receive training at Yale in a wide array of disciplines, there are no common courses required of all BBS applicants. In general, successful applicants will have completed undergraduate coursework in biology, chemistry at least through organic chemistry, physics, and calculus. Each BBS Track may have more specific course requirements, which are described on the Track pages.Applicants must achieve a score of at least 600 on the paper version of the exam, 250 on the computer-based exam, and 100 on the internet-based exam. The application will ask you to submit a Statement of Academic Purpose. TOEFL - Applicants must achieve a score of at least 600 on the paper version of the exam, 250 on the computer-based exam, and 100 on the internet-based exam.