"Minored in" is a phrase generally used in academic settings to indicate a secondary field of study. It can also be substituted with various synonyms depending on the context. Some alternatives include "concentrated in", "specialized in", "focussed on" or "delved into". These synonyms convey the same meaning, that is, the student focused on a specific subject or area of interest. The use of different synonyms can also add variety to writing and make it sound less repetitive. In conclusion, "minored in" is a useful phrase, but it's always good to have alternatives to keep writing engaging and interesting.