This study aims at investigating the effect of cooperative learning model and formative test form toward PPKn learning outcome controlling by prior knowledge. It used factorial design 2 x 2. Sample of this study consists of 80 students who are selected through cluster random sampling. The data was obtained through test instrument. The data was analyzed by using covariance (ANACOVA). The result of this study shows that, after controlling prior knowledge: 1) student’s civics education learning outcome who are taught under cooperative learning model with STAD type is higher than students who are taught under cooperative learning model with NHT type, 2) student’s civics education learning outcome who are given essay formative test is higher than students who are given multiple choice formative test, 3) there is an effect of interaction between cooperative learning model and formative test toward civics education learning outcome, 4) for students who are given essay formative test, student’s civics education learning outcome who are taught under cooperative learning model with STAD type is higher than students who are taught under cooperative learning model with NHT type, 5) for students who are given multiple choice formative test, student’s civics education learning outcome who are taught under cooperative learning model with STAD type is higher than students who are taught under cooperative learning model with NHT type, 6) for students who are taught under cooperative instruction model with STAD type, student’s civics education learning outcome who are given essay formative test is higher than students who are given multiple choice formative test, 7) for students who are taught under cooperative learning model with NHT type, student’s civics education learning outcome who are given essay formative test is higher than students who are given multiple choice formative test.

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