The USNA MarSOT screener is not the USMC MARSOC screener.
MarsSOT is a day of physical tests, humping a rack around, the e-course, o-course (x2), and then humping a rack some more. Mids who perform well may be able to attend some of the "high speed" trainings this summer (airborne, dive school, marine centered stuff).
MARSOC is an initial step for active duty marines to enter the special operations community.