Schools are failing to follow up on work experience placements to reinforce a link between the classroom and careers, a survey suggests.
Most pupils got on well with temporary bosses
A survey of 411 UK pupils aged 15 to 16 found that 70% of those who had completed a placement thought it had not been managed well by teachers.
Some 58% had not had the chance to discuss their experiences, educational charity Edge said.
However, 80% of the students said they had enjoyed their time on placements.
And 90% had got on well with their temporary boss.
The Confederation of British Industry, which backed the study, said businesses deserved more feedback from teachers.
Senior policy adviser for employment and skills, Mariska Van Der Linden, said: "Employers are committed to providing the work experience which can help young people gain valuable skills but, as the findings from Edge confirm, too many employers and students are finding it difficult to make placements a worthwhile experience.
"It is worrying that only a third of students think their work experience was well planned and managed by their schools.
"We need more support and guidance for employers - and students - to turn the goodwill into a really worthwhile experience for all concerned."
According to the pupils, the top three skills they gained from work experience were working as a team member, communicating with people and punctuality.