lol the 99 cores shows you why Psych 1X03 is basically the biggest course at Mac.
You only choose one and yeah it's an hour one day a week, but it isn't actually your core, but technically a tutorial (no one calls them cores).
Your lectures for the course consist of online lectures (premade/prerecorded, videos supplemented with visuals/graphics/animations plus scenes of Dr. Kim himself talking to you
)
so yeah for X03, the lectures are basically online and your tutorial/core time is your chance to like discuss the material with other students taking the course with you
hope that helps!