Following the U-turn, the students are now being allowed to return to St Olave’s in Orpington next week for their second year of sixth form.
Lawyers claimed the pupils were initially barred from the school after failing to achieve B grades in exams during their first year of sixth form.
Their parents took legal action against St Olave’s in a bid to initiate a judicial review which might force the school to back down.
St Olave’s said: “Following a review of the school’s policy on entry to Year 13, the headmaster and governors of St Olave’s Grammar School have taken the decision to remove this requirement and we have today written to all parents of pupils affected to explain this and offer them the opportunity to return to the school and continue their studies.
The announcement was welcomed by Dan Rosenberg at Simpson Millar solicitors which has been representing the families.
Mr Rosenberg said he was “pleased the school has agreed to readmit the children and withdraw their policy” and added “we would now expect all other schools with similar policies to do the same.”
In it’s statement, St Olave’s continued: “Our aim as a school has been and continues to be to nurture boys who flourish and achieve their full potential academically and in life generally.
“Our students can grow and flourish, making the very best of their talents to achieve success.”
The school has operated a policy to “maintain its exceptional A-level results” which means Year 12 pupils have usually needed three B grades or higher to progress to Year 13.
Year 12 tutors were told in an email dated in June this year that pupils who scored a C would not be allowed to continue that subject through to Year 13.
A prestigious Church of England school in south east London has reversed a decision to exclude two pupils over their exam results.