More specifically, students have to complete numerous questions with very long answers for four different subjects, and the time available for each subject is three hours.

specifically 是形容词 specific（具体的、明确的）加上副词后缀 -ally 构成的副词形式，意思是"具体地、明确地"。 specifically 在这里用来更精确地说明学生需要完成的任务细节。