The primary purpose of the Traditional (Tridentine) Latin Mass is not to learn -- it is all about the proper, solemn worship of God.
It is a very good idea to have read a book or two beforehand on the Mass (as ParentsForTruth recommended, above).
Also, most parishioners need to follow along in a Latin-English hand missal. Few Latin Mass attendees understand Latin, although it's easy enough to learn the common phrases (Dominus vobiscuм = the Lord be with you)
The Mass is Calvary made present again. The same sacrifice is taking place. For that reason, you can meditate on the Sorrowful Mysteries, or the Crucifixion in particular during the Mass, and get a lot out of it. There is more than one way to attend Mass.
The reason 99.9% of people attend the Tridentine Mass/Traditional Latin Mass today is because they want to worship God in a reverent, becoming manner. They want a Mass that is God-centered, rather than man-centered.
Unfortunately, the Novus Ordo centers on man too much. The priest faces the people, speaks in English, etc. There is ZERO awe or mystery. There are other problems, too, but that is a start.
I hope this helps,
Matthew