The importance of applying cooperative learning and aiming toward an increase in motivation to maximize the effectiveness of the learning process has not sparked an intense research interest in the Bosnian EFL context. Thus, the current study, conducted among 211 high-school participants, explores the impact of gender and grade level on students' cooperative learning and motivation for EFL learning and aims to determine whether any cooperative learning components are significant predictors of students' motivation and their EFL achievement. The findings showed no significant gender and grade level differences in cooperative learning and motivation. Additionally, the results revealed that individual accountability and interpersonal skills are significant predictors of participants' motivation and that promotive interaction and interpersonal skills are significant predictors of their EFL achievement. The research points to the importance of incorporating cooperative learning strategies and motivation-strengthening activities into EFL teaching, which will eventually lead to the improvement in students' EFL achievements.