The article deals with the analysis of peculiarities of language acquisition assessment system in Kazakhstan--KAZTEST. The author pays attention to the role of control as a way of assessment students' skills, habits and knowledge. In addition, author determined the place and functions of tests as a form of control. The author explores the specificity of testing in the educational system of Kazakhstan. KAZTEST system is the Kazakhstani system based on international standards. The KAZTEST system plays an important role in social and political life of the Republic of Kazakhstan. Its national peculiarities, advantages and disadvantages are determined in the present research. The background of KAZTEST formation and its role in society are under discussion in the framework of official language policy of the Republic of Kazakhstan. However, besides Kazakhstan, the language policy problems are the inherent part of national policy in many multinational and multilingual countries.