Grade results from the tests from learning from teaching but did not intelligence or memories, all because there are still other factors involved, such as understanding of the lessons that might have a different interpretation, which is a result of the recognition that different. Different basis or even for that time in the environment that affect the recognition, however different grade concrete things that ก้ยังเป็น. From the General society that accepts all students need to have tests to measure knowledge in accordance with the purpose of teaching. In addition, the upgrade may be from a different test, such as the oral test. The test measured by written A test by which to select the exercise as a form of a reasonable test. To make the grade or the results from the tests are reliable and more references.