School-related wellbeing, academic buoyancy, and adaptability are valued constructs in their own right, as indicators of student welfare and as predictors of academic achievement. In the present study, we examined the impact of a six-session multi-component, intervention on school-related wellbeing, academic buoyancy, and adaptability. Participants in their first year of upper secondary education were randomly allocated to early intervention groups, or wait list-control groups. Following baseline measurements, outcomes were assessed after the early intervention groups and again after the wait list-control groups. Following intervention, a slowed decline was shown in school-related wellbeing and adaptability was boosted. Buoyancy was boosted in the early intervention group but not the late intervention group. Findings show how a relatively short intervention can beneficially impact on student outcomes. Booster sessions may be required to maintain the benefits for wellbeing and adaptability.