AHS has continued to excel in various categories both in academics and in co-curricular activities.
The school is among the best performing high schools in the country academically, ranked amongst the top 10 positions every year. Bush holds the country record for most consecutive years holding the pole position in the national exams (1960–1985). In the K.C.S.E results announced in 2011, the school emerged top in the country. In that same year, the school had more than 100 students scoring a mean grade of A in the national exams.