PREview was designed to be an "everlasting" score, so individual schools must set policy on how recent they want scores to be for admissions decisions.
Basically, PREview is a game of "21"... once you hit 7, stop. You have 4 lifetime chances to get 7.
April is the month where I expect all the policies for the cycle will be posted. Check all websites and assume MSAR is not fully updated.
Read
Abstract: Situational Judgment Tests (SJTs) are a cornerstone of holistic admissions in U.S. and Canadian medical and health professions programs,
www.studentdoctor.net