Although most second language learning studies involve high-educated participants, addressing low-educated participants seems important as research suggests that education background impacts second language (L2) learning efficiency. A controversial point in the L2 learning literature is the role of corrective feedback (CF). Research on CF in relation to individual differences, including education background, requires controlled experimental environments. This article presents a study in such a controlled environment: a computer assisted language learning (CALL) system with logging capabilities and automatic speech processing to provide CF on spoken grammar practice. In the experiment, 68 Dutch L2 learners were randomly assigned to either an automatic grammaticality CF condition or a NOCF (no corrective feedback) condition. We analysed learning outcome, evaluative measures, and practice behaviour logged by the CALL system. Practice behaviour differed with education background, which in turn related to learning outcome. Learners with high and medium education levels benefitted from speaking practice in both conditions, while low-educated learners did not benefit from practice, in neither condition. For medium and high educated learners there was a trend for CF to increase practice effectiveness. Education level therefore is an important individual difference in L2 learning research that influences the effectiveness of CF.