The headteacher of the school where 16-year-old Ajmol Alom attended has sent several pictures of the "star pupil" to ITV London.
Chris Dunne, headteacher at Langdon Park School, said he had a "very bright academic future ahead of him".
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Scotland Yard said two murder investigations have been launched following the separate incidents, which both happened in the past week.
Photos show the extraordinary surgical procedures to remove the growth.
The Met Police says 143 firearms have been handed in at stations across the capital in just seven days, including two antique machine guns.