Going into Tufts MBS is a $100k mistake. You will pay every penny with interest. By the time you become practicing physician, this 100k loan will become 200k+ with interest. you not only lose another 1-2 years by enrolling into this program, but you also lose a year's income as practicing physician. This program will barely improve your application. And they lie to you about how they will get you into their Tufts medical school if you get above 3.7 gpa. There are many classmates of mine who had Tufts MBS GPA >3.9, MCAT>509, with stellar volunteer + work experience but didnt get accepted to anywhere including Tufts MD. If you actually want to get into med school, invest your money into getting a high MCAT score or get into a masters/postbac program that guarantees admission to their MD program. This investment's cost outweights the benefit.
if you want to get into tufts dental school, this program can work for you though.
if you have 1 year to prepare for admission to med school here is my best advice:
get a great MCAT score
take part time science courses (biochem, physiology, pathology, pharmacology) at a cheap program that will inflate your undergrad GPA
do part time research