2. The English test was designed in a multiple-choice from on the basis of Mathayom Suksa 5 core curriculum.
3. The revised questionnaire was submitted to the thesis advisor, two university instructors and one school instructors in order to check the validity of the content of the questionnaire by means of index of congruence (IOC).
4. The revised English test was submitted to the thesis advisor and three school instructors in order to check the validity of the content and the distribution of the test questions by means of index of congruence (IOC).
5. The questionnaire and the test were tried out with 40 Mathayom Suksa 5 students of Saint Joseph Nakhon Sawan School in Muang District, Nakhon Sawan Province. To ascertain the reliability of the questionnaire and the test, the Cronbach’s