Sion School enjoyed another year of exceptional GCSE results, continuing its tradition of academic excellence and student achievement. The 2025 results place SION significantly above both national and county averages, showcasing the school’s commitment to nurturing high performance and personal growth.
Exceptional GCSE Performance Across the Board
In 2025, 94% of students achieved grades 9–4, marking a 3.6% increase from 2024. Even more impressively, 48.6% of students earned top grades (9–7) – more than double the national average of 23%.
Gender Breakdown:
- Boys: 93.4% at 9–4 (+7.5%), 46.2% at 9–7 (+16.1%)
- Girls: 94.6% at 9–4 (–1.5%), 51.1% at 9–7 (+5.6%)
National and County Averages:
- National averages: 70.5% (9-4), 23% (9-7)
- West Sussex averages: 72.2% (9-4), 20.9% (9-7)
Value Added (VA) Score: Progress Beyond Expectations
Sion’s internally calculated Value Added (VA) score stands at +1, where +1 represents a full grade of progress beyond expectations. In addition, 1 in 6 Sion School students achieved an average VA score of at least +2 – 2 grades higher than their baselines.
Steve Jeffery, Headteacher of Sion School, shared his pride in the students’ achievements:
“We are incredibly proud of our students’ achievements this year,” said Steve Jeffery, Headteacher.
“To see a 10.3% increase in top GCSE grades compared to last year – and more than double the national percentage – is a fantastic reflection of their commitment and effort. Our value-added score shows that students are making progress well beyond expectations, particularly in subjects such as English Literature and English Language”
Thinking about GCSEs for your child?
Read our Guide to GCSEs to learn more about our approach, subject options, and how we support every student to achieve their best.
* National and County Average Data Figures quoted come from Ofqual and Value-Added data is provided by www.fft.org.uk
