Background: According to Dweck's mindset theory, implicit beliefs (a.k.a. mindset) have an organizing function, bringing together mindset, achievement goals and effort beliefs in a broader meaning system. Two commonly described meaning systems are a growth-mindset meaning system with mastery goals and positive effort beliefs, and a fixed-mindset meaning system with performance goals and negative effort beliefs. Aims: Because of assumed heterogeneity within these two meaning systems, we aim to (1) examine multiple-mindset profiles based on mindset, achievement goals and effort beliefs, by using a data-driven "person-oriented approach," and (2) relate these different profiles to several outcome measures (academic achievement, motivation and school burnout symptoms). Sample: Self-report questionnaire data were collected from 724 students (11.0-14.7 y.o.; 46.7% girl; 53.3% boy; M[subscript age] = 12.8 y.o.). Methods: Latent profile analysis was conducted using mindset, achievement goals and effort beliefs. Results: Four profiles were revealed: one fixed-mindset profile and three growth-mindset profiles, which differed in their performance goal levels (low, moderate and high). Growth-mindset students with low- or moderate-performance goals had more advantageous outcomes, for example, higher math grades and lower school burnout symptoms, compared to growth-mindset students with high-performance goals. Fixed-mindset students had the least advantageous outcomes, for example, lower grades, less intrinsic motivation and more school burnout symptoms. Conclusions: Our study emphasizes the importance of taking a holistic approach when examining mindset meaning systems, revealing the importance of the level of performance goals and including multiple academic outcomes.