You don't know what seminary is? Check it out here
Mormon.org explains what seminary is:
Church of Jesus Christ of Latter-day Saints organizes religious
classes, called "seminary," during the week so that secondary school-age
students of all faiths from around the world can grow spiritually at
the same time they grow in secular knowledge.
Students today have to work hard to meet high scholastic standards, but many find that taking a #seminary
or institute class actually helps them deal with the stress of their
other school work. Mormons believe that when we apply the spiritual
dimension of faith to our study— even of worldly things— we can amplify
our intellectual capacity.