This study examines and refines a grammar placement test using the classical test analysis. The participants were 44 international students who were studying Japanese at Okayama University in Japan. After revisions were carried out on grammar test items that are high in item discrimination and low in item facility. The new version was found to be more efficient than the old one, since it make the overall test more difficult while keeping the same reliability level as before. When the result of dividing classes was predicted, it was found that new grammar test items were significant predictors.