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This was developmental research aimed at developing a test for testing students- mathematics competency as prospective secondary school mathematics teachers. The test result will be the prerequisite ability which will determine mathematics students- feasibility to step forward to the research proposal seminar to undertake their thesis. The research respondents were 32 third-year students of the mathematics department of FMIPA UNM. Within this research, the test was developed through five phases, namely: (1) devising the test specification; (2) writing down the test; (3) reviewing the test; (4) trying out the test; (5) analyzing the items of the test from both difficulty level and item discrimination. Determination of the accepted items after trying out referred to the analysis results based on item discrimination, i.e. the ability of the questions to differ students with high from low ability in mathematics. The measure of the item discrimination coefficient was from –1 to 1. The analysis results were classified into three categories, namely: accepted without revision (if the item discrimination coefficient is greater than 0.30), accepted with revision (if the item discrimination coefficient is from 0.10 to 0.29), and rejected (if the item discrimination coefficient is less than 0.10). There were 45 multiple-choice items written, tried out, and then analyzed. The analysis results showed that 21 items were accepted without revision, 17 items were accepted with revision in terms of the language construction and the difficulty level of the items, whereas 7 items the rest were rejected. Thus, 38 of the 45 items were feasible to use in testing the students- mathematics competency.