This study investigated whether different groups of test-takers vary in their reported test-taking behaviour in a high-stakes test situation. A between-group design (N = 1129) was used to examine whether high and low achievers, as well as females and males, differ in their use of test-taking strategies, and in level of reported test anxiety and motivation. The results showed differences between high and low achievers on a number of test-taking strategies, where high achievers reported using successful strategies to a higher extent. There were also gender differences: females, for example, reported using random guessing to a higher extent than males. Further, low achievers, especially females, reported significantly higher levels of test anxiety than high achievers, and high achievers reported slightly higher levels of motivation when compared to low achievers. To conclude, test-taking behaviour might bring additional variance to test scores, whether or not this is irrelevant variance is discussed.