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Colleges are facing increasing problems with behaviour, with male learners on courses such as construction among the worst offenders, according to a report by education inspectors.
Estyn said issues such as absenteeism, vaping, lateness and social media misuse were "widespread" and students still struggled with the effects of the Covid pandemic on their social skills and resilience.
It added funding was one of the biggest barriers to improvement and called for clearer national guidance on behaviour.
The Welsh government said it was working on behaviour in schools and colleges and was holding a roundtable on safety.