estudió

third-person singular preterite indicative of estudiar

en

1. in, at, on
2. in (a time)
3. in (a language)
4. used after some verbs and translated by various prepositions in English
5. in (in various expressions)

el

masculine singular definite article; the

instituto

1. institute
2. secondary school, senior school

de

• Noun

  The name of the Latin-script letter D/d.

• Prep