Actually I think several of the large Taiwanese monasteries do insist on high school.
And many of the monks and nuns have BAs and even graduate degrees. If your level of education is higher, you will have access to a broader variety of opportunities in the monastery. If you don't have a degree, your options will be very limited. Chinese culture really values education. A degree would be less of an issue at a Theravada or Tibetan monastery.
In order to ensure my mind never comes under the power of the self-cherishing attitude,
I must obtain control over my own mind.
Therefore, amongst all empowerments, the empowerment that gives me control over my mind is the best,
and I have received the most profound empowerment with this teaching.
brtsal ba'i bkhra drin