The purpose of this research is to develop and to validate the ÉMRT (Échelle de motivation à bien réussir un test). The ÉMRT consists of four sub-scales : intrinsic motivation, extrinsic self-determined motivation, extrinsic motivation and amotivation. Following the development process, factorial structure of the ÉMRT was tested in two evaluation settings (formative and summative) for validation. The results indicate that ÉMRT respects the factorial structure of the four subscales and presents good psychometric properties. Finally, differences were observed in the correlation between ÉMRT’ subscales and the test’ performance in each of the evaluation settings.