A Prince's Trust study says more children are arriving for lessons hungry, dirty and struggling to concentrate.
In some cases ''scavenger'' pupils have been caught finishing scraps of food.
The findings are based on interviews with more than 500 secondary school teachers.
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Leader Paul Nuttall - who is yet to confirm if he will stand for election - denied policies aimed almost entirely at Muslims were divisive.
When Suray Mohamed left her village she was a wife and mother-of-seven - but just weeks later there is only her left.
The band split up 29 years ago and barely talked since.