A student at St Paul's Catholic College in Burgess Hill achieved grade 9s in all ten GCSEs.
Lucy Barnard is among the highest performers in the country.
Speaking to the Middy today, she said she was 'ecstatic'.
She added: "It has been so stressful and it is so nice to see the hard work has paid off and to see everyone so happy."
Lucy is off to BHASVIC college in Brighton next month to do A-Levels in history, English literature and maths.
Standing beside her at the school today was Sam Acosta-Fernandez. He achieved an impressive eight grade 9s, three 8s, and an A* in Spanish.
He told the Middy: "I am so happy, it couldn't have gone better if I am honest."
Proud mum Margarita praised the school for supporting students through 'so many exams'. "I am so happy and proud of Sam," she added.
"And I am so happy it is over for him. It was very challenging."
Eighty-three per cent of students at the school in Jane Murray Way achieved a grade 4 or above and 56 per cent achieved a grade 5 or above in English and maths.
Rob Carter, headteacher, said: “We are so proud of all the students and the hard work and dedication they have put in.
"To get these results in the new more challenging curriculum is down to their hard work, inspirational teaching and supportive families.
"We look forward to them flourishing in the next chapter.”
Other top performers at the school were Sophie Atherton-Barnes, who achieved nine grade 9s, two grade 8s and one A* grade and Ciara Howard, who achieved nine grade 9s and two grade 8s.
The school said these grades were 'particularly impressive' in that the new curriculum looked to 'stretch top performance' and only the top three per cent nationally were awarded grade 9s.
Phil Byrne, director of key stage 4 achievement, added: “I am thrilled to share in these with the results with the students today.
"We look forward to welcoming them and our new students back to study in the sixth form on September 4.”
Some 'exceptional' results also came from students below, who achieved grades, which were the equivalent of A* and A.