It can be seen from Bar Graph 2 that there is no correlation between grade
level of participants and English-Thai sentence translation test scores, that is, all three groups of participants performed only slightly better than the others, 62.67% for Matayom 4 participants, 62% for Matayom 5 participants, and 64.67% for Matayom 6 participants. However, there is an indication of correlation between grade level of participants and the Thai-English test scores, that is, Matayom 4 participants did not do so well (49 %) in comparison with those in higher grade levels, 54.33% for Matayom 5 participants and 64 % for Matayom 6 participants, respectively.