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.
Building a business is difficult. Building a business in which all stakeholders benefit from your actions or the actions of the business entity is even more difficult. A stakeholder is anyone who is affected by your business in one way or another. Stakeholders are not necessarily stockholders, although stockholders are stakeholders.