Перевод - Испанский-Английский - Hice un máster en la Universidad de J., pero no...

alumno libre = oyente; el alumno que acude a las clases sin estar matriculado y, por lo tanto, no supera ningún examen y no recibe ningún título.

University of J. -> or: J. University, depending on which university this is.

‘ I have done a master’s ‘ implies the course was completed successfully. Since that is not the case here, it would be better to replace the first sentence with ‘ I have followed a master’s course’ or something similar. I did not put this in the translation because in my opinion, the same applies to the Spanish text.

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