Missing child prodigy Sufiah Yusof has passed her end-of-year exams, Oxford University has revealed.

The results of her third year maths exams were posted up outside the Examination Schools in High Street yesterday, but University authorities do not know if Sufiah is aware of her success.

And police are still urging the 15-year-old to come forward to let her family and friends know she is safe. The St Hilda's College maths genius was last seen by her father Farooq after her final-year maths exam on June 21. She has completed three years of a four-year degree course.

Following a national appeal, police have been swamped with calls from members of the public who believe they have seen the missing student. Callers claiming to have seen the 15-year-old have telephoned police from Edinburgh, Northampton, Swindon and London.

Oxford Police spokesman Duncan McGraw said: "These are only possible sightings and nothing has been confirmed at the moment."

Anyone with information should call police on 01865 266000.