According to Wikipedia:
[the Catholic Herald reports h]e studied and received a master’s degree in chemistry at the University of Buenos Aires before he decided to pursue an ecclesiastical career. According to another reference [La Nación (Spanish)], he graduated from a technical school as a chemical technician and at the age of 21 decided to become a priest.
Being Wikipedia, this could all change in a few minutes. For now there are these two comments in the Talk tab for the Wikipedia article:
1) I dont think the cite that says he got a masters degree is accurate. In this newspaper http://www.lanacion.com.ar/1562738-bergoglio-un-sacerdote-jesuita-de-carrera they claim he studied chemistry in high school. Additionally, at that time there were no masters degree in Argentina, the closest you can get is an "engineering" degree. bcartolo (talk) 21:40, 13 March 2013 (UTC)
2) The detailed reference above supports Bcartolo’s comment; it gives details of the school from wich he graduated as chemical technician, and says that he decided to follow the priesthood at 21 (too young for a master’s degree). In point of fact I do think that in 1957 there was a degree of "licenciado en ciencias químicas", which is comparable to a master’s (at least 4 years), though the reference above implies Bergoglio didn’t study for it. There certainly was such a degree a few years later. I suppose that this will be clarified as time goes by. Pol098 (talk) 01:11, 14 March 2013 (UTC)
^ La Nación newspaper: Jorge Bergoglio, a career Jesuit priest, 13 March 2013 (Spanish) Article gives detail: he graduated from industrial secondary