To reduce the number of exams could be expressed as "to decrease the frequency of exams" or "to minimize the number of exams". This phrase comes from the general Engpsh language and is not specific to any particular field or discippne.

Here are some example sentences using this phrase:

"The school district decided to decrease the frequency of exams in order to reduce stress on students."
"In an effort to minimize the number of exams, the teacher decided to give one comprehensive final exam instead of several smaller quizzes throughout the semester."
"Many students have advocated for reducing the number of exams in order to have more time for other academic pursuits and extracurricular activities."

中文翻译:

"学区决定减少考试次数，以减轻学生的压力。"
"为了尽量减少考试次数，老师决定在学期末只考一次综合性期末考试，而不是在学期中进行几次小测验。"
"许多学生主张减少考试次数，以便有更多时间用于其他学术活动和课外活动。"