Practical assessments for GCSE and A-level pupils may have to be delayed at a Streatham school because of the air travel disruption caused by volcanic ash from the Icelandic volcanic eruption.
Pupils at Streatham and Clapham High School for Girls are due to be sitting their practical drama assessments next week.
But Phyliis Warner, office manager at the private school, said she knew some pupils sitting the practical exams had been stranded abroad.
She said: "We will have to delay the assessments if they can not get back with suitable time to prepare. Those pupils affected are our biggest concern to do with the volcanic ash right now."
She said the school was already aware of four teachers and eight pupils who had been marooned abroad because of the ash cloud clogging the skies preventing air travel.
Two teachers have resorted to rail travel in a bid to make it for the first day of term tomorrow, she added.
She said with the new term starting tomorrow, more absences because of the ban on air travel were expected to be discovered then.
An estimated 150,000 Brits are currently estimated to be stuck abroad.
One school in Lambeth was closed today because too many of its teachers had been unable to attend after getting stuck on their Easter holidays abroad.
A Lambeth Council spokeswoman said Walnut Tree Primary School in Kennington is expected to be be open as normal tomorrow.
No offical figure for teacher and pupil absences today as a result of air travel disruption is currently available for Lambeth.
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