So, your son was admitted through the "Science" domain.
My daughter was admitted under the "Humanities" & "Leadership" domains. Last time, her elder sister was admitted under the "Mathematics" & "Science" domains. They have quite different characters and strengths.
Although my elder daughter joined the "Support Measures for the Exceptionally Gifted Students Scheme" through the "Science" & "Maths" domains in 2008 [now the HKAGE], she mainly attended the "Leadership" courses. The only science course she attended is "Engineering + Bio-medicine =Biomedical Engineering?" organised jointly by HKAGE & HKU in 2009. It seems that the course is now not on the course list in HKAGE's website.