Chailey School is one of the top 90 non selective state schools in England, according to the Government.
The Minister of State for Schools David Laws wrote to head teacher Lesley Young to tell her the good news.
Mr Laws said: “(Chailey School) has proven to be one of the top 90 non-selective state funded schools in England showing the greatest sustained improvement in the percentage of pupils achieving five or more A*-C grade GCSEs including English and mathematics GCSEs.”
He went on to congratulate Mrs Young on the hard work and success of staff, governors and pupils over the last three years.
Mr Laws thanked the head teacher and her leadership team for their drive towards the highest standards of educational achievement.
Mrs Young said: “There is no doubt that staff and pupils, supported by governors and parents, work tirelessly every year to ensure that all our young people fulfil their potential.
“Having recently received an ‘Outstanding’ grade from the Local Authority and confirmation that the class of 2014 were placed 3rd out of 55 similar schools nationally in last week’s Performance Tables, the knowledge that we are consistently one of the top performing schools in England is fantastic.
“When I opened the letter from the Department for Education last Friday I was so proud of all my colleagues and students – they are absolutely brilliant and deserve to know how good they are.”
Mrs Young said an extract from the Performance Tables and a copy of Mr Laws’ letter is on the school website.