The Tridentine Mass is on a one year cycle. The readings for Sundays and holy days never change, as well as for the weekdays of Lent.
The Tridentine Mass doesn’t have daily readings like the Novus Ordo Mass. The Tridentine Mass will take the reading for the saint of the day in the proper if there is one or in the common readings. Votive Masses also have their own readings. When there is no feast being celebrated, which is known as a feria, the priest can take the Mass of the preceding Sunday or a Votive Mass. There are Votive Masses for each day of the week. Monday is for the Holy Trinity. Tuesday is for the Angels. Wednesday is for Sts. Peter and Paul or all the Apostles. Thursday is for the Holy Spirit or the Blessed Sacrament. Friday is for the Holy Cross, Passion of Our Lord Jesus Christ, or the Sacred Heart. Saturday is for Our Lady.
There are also various Votive Masses that can be offered on feria day. Some include in time of war, for the healing of schism, for the propogation of the faith, for peace, in time of pestilence, for the forgivesness of sins, for the sick, and for the grace of a holy and happy death.
The reason for the three year cycle is that it covers the entire bible. If you go to the Novus Ordo Mass every Sunday for three years straight you will hear the entire bible. I prefer the one year cycle because it gives us a familiarity with the readings. We can then go and read more on our own.
There was also a consistency with the readings that can’t be found now. For example, during holy week in the Tridentine Mass, the Passion according to St. Matthew is read on Palm Sunday, the Passion according to St. Mark is read on Tuesday, the Passion according to St. Luke is read on Wednesday, and the Passion according to St. John is read on Good Friday. Now the Passion according to St. Matthew, St. Mark, and St. Luke rotate on a three year basis. The Passion according to St. John is still read on Good Friday. Instead of hearing all four Passion accounts during holy week, we now only hear two of them.
You’re asking many good questions. I hope my answers have been a help to you.