This research is aimed at studying correlation between motivation and mastery of materials particularly in context of test construction among teachers. This research used quantitative method in collecting and analyzing data. It found that there was a correlation between motivation and mastery of materials among teacher. Therefor, researcher suggested that teachers of Islam education had to be given training so that they could enhence their abilities in teaching and particularly in constructing a test. In addition thereto, the researchers suggested that Ministry of Religious Affairs administers continuous programs that are intended to prepare the teachers to be qualified educators.