Tanbridge House School in Horsham saw 79 per cent of its students gain five or more A* to C GCSE passes including Maths and English.
A total of 96 per cent of the year group gained five or more good A* to C passes overall.
Headteacher Jules White commented: “These remarkably good results are the culmination of several years of hard work and dedication across the school.
“I would like to thank my staff for their professionalism and parents andcarers for their wholehearted support of the school.
“Most praise, however, must be reserved for the students themselves who have performed superbly. The results are outstanding by any measure.”