Stark provides education materials, including test preparation resources for students and teachers, lesson preparation materials and career advice books.

The acquisition will see Pearson diversify its business in Germany, which currently includes higher education text books and digital resources, English language teaching material and professional books.

The company expects the deal to generate a return above Pearson’s cost of capital from 2012, its first full year after acquisition.

In fiscal year ended 31 July 2010, Stark had revenues of approximately €20 million (£17.48 million), and has gross assets estimated at €32.6 million (£28.5 million).

Chief executive of Pearson’s international business, John Fallon, says the company has seen growing numbers of students requiring help and support to prepare for examinations.

‘Stark is already highly respected by German teachers, students and parents; with access to Pearson’s digital solutions, it can play a bigger role in helping students to learn more effectively,’ adds Fallon.

Syntegra backed a management buy-in of Stark in December 2006.