This tool standardized to find out Higher Secondary students’ Linguistic Competence (in Tamil. This tool consists of 17 questions covering the necessary Components of a Linguistic Competence Test. To validate this tool a pre-test out study was conducted among a random sample of 200 of Higher Secondary students of Kanjeepuram, District, Tamilnadu, India. The results of the analyses reported have consistently shown that the developed questionnaire is having reliability and validity at 0.05 to 0.001 levels of significance.