Mother tongue has an important place in human life. One’s mother tongue contributes a lot in thinking habits, learning of subjects and imagination etc. to any person. Students have to attain knowledge of different subjects by the medium of their mother tongue. Vernacular language has remained in root of any other language which is to be learnt, so evaluation of knowledge of mother tongue by using tests is of equal importance. Present research had been aimed at construction and standardization of the Achievement Test of Gujarati language for standard IX.