The incident took place in Kot Village on the outskirts of Dargai town when the students were on their way to a picnic in the mountainous areas.
"The students were aged ten to 16 years were going for a picnic when their tractor trolley turned turtle and injured the students," said Inayatur Rehman, a doctor at the hospital where the students were treated.
Four of a family die as bus overturns near Thatta
He blamed the accident on the driver's negligence. The vehicle suddenly turned turtle and injured the 40 kids, with many of them in serious conditions.
The victims were shifted to Mardan and Peshawar for treatment.
Pakistan has one of the world's worst records for fatal traffic accidents as only earlier in the day four members of a family, including three children, died while 20 others sustained injuries in a bus accident near Sindh’s Thatta district.
The accident had taken place after the over-speeding bus overturned and fell in a ditch in the Gujjar area.
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