Regarding scores of grade-six students, most of them had quite low scores in mathematics, sciences and Thai
language even though teachers were well aware of mistakes, with some confusion on the teachers’ side. This shows
that if teachers are given opportunities to implement data from tests to their teaching, and feedback is given to them
on a regular basis, learners’ education will be developed in an effective and efficient way. Marzano (2006)
suggested that proper feedback from teachers increased students’ learning capacities and raised their learning
achievement.