Belgium, Brussels
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Best IBDP average in Belgium (36 points in 2025), 40% of students scored 38+ points, top individual score of 43 points
St. John's International School is a co-educational day and boarding school in Waterloo, Belgium, founded in 1964. The school offers the full IB continuum from ages 3 to 18 and boarding for students aged 11-17. With 65+ nationalities represented, it boasts the best IBDP average in Belgium (36 points in 2025), with 40% of students scoring 38+ points. Its performing arts centre is described as the finest of any school in Belgium.