Westminster School is at the top of the tree when it comes to GCSE performance among independent schools, according to the latest available data.The private boys’ school achieved a 98.61 per cent A*-C/9-7 rate – one of four schools to surpass 95 per cent for the top grades, according to the Independent Schools Council (ISC).Our interactive league table allows you to search these results by school and compare private schools of your choice against one another.Some independent schools decline to release their results in this fashion, so it may be possible that there is a better performing school out there. However, Westminster School is the best among the roughly 300 schools who entered at least 25 candidates and agreed to have their results published.Search for the best independent schools for 2019 A-level resultsSearch for the best grammar schoolsSearch for your school or town to find out where it ranks As many as 95.6 per cent of independent school entries received a C/4 grade or higher, compared to 67.3 per cent for all schools nationally and up 0.1 points compared to last year.The proportion of relevant entries that were awarded a level 9 – the highest available under the new reformed system – was 23.1 per cent this year, more than five times the national average.Barnaby Lenon, chairman of ISC, said: “Independent school pupils and their teachers should feel incredibly proud of their achievements, especially in light of the significant exam reforms that have taken place – the impact of which is still being felt by many schools regardless of sector.“It is very impressive to see such a high proportion of entries awarded a grade 9. Additionally, and given many independent schools are not academically selective, the fact nearly every exam entry was passed (C/4 or higher) is noteworthy. This year’s Year 11 GCSE exam results have revealed that nearly two thirds – some 62.1 per cent – of GCSE entries at ISC schools were awarded an A/7 or higher. This is nearly three times the national average of 20.8 per cent.In total, 20 schools with more than 25 students managed to get 90 per cent of their entries gaining an A/7 or above, according to the ISC. Guildford High School for Girls and North London Collegiate School came second and third in our table with 97.27 per cent and 96.29 per cent of grades at A/7 or better respectively.King’s College School in Wimbledon came in fourth place, with 95.88 per cent of entries achieving either a 9-7 or A/A*. This is the third year since changes in the GCSE regime meant that a new numerical system was used to mark several subjects.In an attempt to toughen up GCSEs, the new system uses grades nine to one, rather than A* to G – with grades 7-9 being equivalent to A/A* in the old system.The new grades are being phased in to account for more and more subjects each year. “Our schools are committed to providing a broad education and offering extra-curricular activities, all with a view to enabling every child to find the right path so they can fulfil their potential.”Search for small independent schools for 2019 GCSE resultsYou can also search the following table to compare the performance of schools fielding fewer than 25 candidates. Those that field fewer than 10 are excluded from our rankings altogether. You can also:Search for the best primary schools near youSearch for the best schools near you for GCSE resultsSearch for the best schools near you for A-levelsNote: Schools have been ranked by their rate for A*-A or 9-1 grades, for both GCSE and IGCSE results combined to two decimal places.*Results for d’Overbroeck’s school are for UK candidates only. d’Overbroeck’s also has a separate international section where pupils complete a one year GCSE programme. Results for international students, for whom English is not their first language, are not included in the statistics stated in this article. If you’re having problems with this interactive on our mobile app, click here to load the article in your phone’s internet browser. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.