I took an LDS-developed Spanish course, too - 2 months in the MTC in 1980.
Still speak, read and write fluently, without 'missing an accent
mark'.Many native speakers come from countries where 6 or 8
years of schooling are mandated - if they are lucky. Not surprising that they
have to go back to school to re-learn their 'native' tongue.
I currently teach a Spanish reading/writing class from a curriculum developed by
the LDS Church. The purpose is to give the student the ability to read in their
native language the scriptures aure. Also to be able to compose their thoughts
and feelings such that they can write them ina coherent and meaningful way, to
share with friends and family. The emphasis is on daily practice and home work,
with instruction and follow up, encouragement and introduction to gospel topics
during the Sunday School class time. Being a degreed Spanish teacher, the LDS
curriculm is designed to take a student at what ever level of expertice, and
improve upon it.