Most top programs' interviews are primarily behavioiral interview questions aka social interview. (they can choose among clerks, already weeded out clerks and any non-clerk interviews on good or elite gpa/rank)
Other programs might do academic, behavioral, or typically a mix (sometimes stations with attendings doing academic and director station doing behavioral, etc).
The lower teir programs with few applicants and a weak pool are actually more likely to be academic. They get few or no clerkship visits, and they get applicant interest from mostly avg or below students. Those programs need to try to rule out matching any of the truly dum dum ppl who seldom read, will probably fail boards, etc... so, they will tend to do at least some basic academics.
If you didn't clerk, expect more academic questions.
If you did clerk, it'll typically be more social / behavioral.
...just dress well (classic national TV anchor/politician professional look... not loud colors or edgy style), maybe go over a set of behavioral interview questions... you should already know the academic from studying for clerkships and boards.