Catholic Priests

I have an ancestor from the late 1800's that was a Catholic priest in Zacatecas (possibly Jerez). I would like to find documentation, of his education. I presume the Catholic church has good records of all the priests graduating from the different seminaries in Mexico (Guadalajara, Zacatecas, etc...) I would appreciate any suggestions as to where to begin looking, online. Thanks in advance.