The definition of an exemplar is person or thing that is considered as a pattern to be copied. An example of an exemplar is a person that others try to imitate, such as Michael Jackson. An example of an exemplar is a copy of a manuscript.
A stakeholder in education is anyone who has an interest in the success of a school or school system. They are the parties that are either directly or indirectly affected by the success of an education system.
But the word stakeholder refers to a person who has an interest or concern in the organization at hand. So, in terms of education, a stakeholder is someone who has a vested interest in the success and welfare of a school or education system.