1. Third person singular preterite of 'estudar' with reflexive pronoun 'se', expressing a passive or impersonal action of studying
The topic was studied thoroughly in the classroom.
O tópico estudou-se minuciosamente na sala de aula.
2. Impersonal construction indicating that studying occurred without specifying who performed the action
Much was studied for the exam.
Muito se estudou para o exame.