Assembling the mathematics test from the items have been provided in the item bank requires a special way. This method is related to the chosen theoretical approach in developing test that appropriate with its objectives. In this paper is presented how to assemble the test item response theory approach. Each item in the item bank administered its parameters, i.e. the difficulty index, discrimination index, or pseudo guessing. With these parameters, the value of information function can be computed, and based on the value, the standard error of measurement (SEM) can be estimated. The steps of assembling the test using the item bank are determines the desired SEM, specify the target of value of information function (VIF), drawing the target of VIF, inserting items from item bank that determine the achievement of the target of VIF, these items are then compiled into a test, using criteria of a good test preparation, for example, sorted from the easiest to the most difficult. Keyword: assembling test, value of information function (VIF)