Proudprivate :
My personal experience with short accelerated programs is that US immigration requires either an M1 or a B1 or a B2 VISA.
A B1/B2 is
NOT acceptable and actually explicitly prohibited :
ECFR § 214.2 (7) Enrollment in a course of study prohibited. An alien who is admitted as, or changes status to, a B–1 or B–2 nonimmigrant on or after April 12, 2002, or who files a request to extend the period of authorized stay in B–1 or B–2 nonimmigrant status on or after such date, violates the conditions of his or her B–1 or B–2 status if the alien enrolls in a course of study.