By September 1967 the school was relocated when a fifteen-unit classroom block was completed together with a two-storey science block.
1967, Mr. A.N.B Andrews, had then taken over from Mr. Sanful Snr. as headmaster.
Mr. Andrews leadership saw further developments in infrastructure such as a ten-unit classroom block, a home science block, a technical block and an administration block, a library and a staff common room, a cafeteria and a students hostel to house the six form student preparing for their A-level examinations.
All these were in place by the end of the 1976 academic year.
In October 1976, Mr. Andrews left the school on promotion to Ghana Education Service Headquarters as director for schools and colleges.
His departure coincided with the grant of sixth form status to the school which he worked hard for. Mr. D.R. Essah who was the assistant headmaster acted for a year during the 1976–77 academic year before handing over to Mr. P.O. Sanful, Jnr.
As the substantive Head in September, 1977. Mr. Sanful ran the school until September, 1986.
Mr Sanful did the pioneering work in Sixth Form Education and a Boarding School System at Accra High School.
In January, 1987, Mr. E.B. Dogbe became the new Headmaster. He was a person full of discipline and Principles and kept his words. Punctuality was the order of the day.
He retired in November 1996 and handed over to Mr. Ben. Nikoi koteye as the substantive Headmaster, in whose term the school celebrated its 75th (Diamond Jubilee) with great pomp and gaiety.
A monument was raised by the old students to commemorate the occasion.
Under his headship, the school achieved very remarkable academic results.
There was cordiality among the staff and moral was also high among teacher and students. His period saw parents changing their attitude towards the welfare of their children, leading to a vibrant Parent Teacher Association which led subsequent Development in the school. He also saw the landscaping of the compound.
In April 1999 upon the retirement of Mr. Ben Koteye, the mantle fell on Mrs. Sylvia Asempa, the first female to head the school.
She continued the good works that her predecessors had set in motion. It was during her time that Accra Ring Road central with support from the Rotary foundation of Rotary International constructed a multi-purpose playing court on the reclaimed waterlogged triangle of the school.
She was also the first bilingual Headteacher of Accra High School. She spoke fluent French hence the further development of the French as a foreign Language in the school.
The P.T.A. Converted the basement of the existing school flat into two, two bedroom unit for staff occupation as well as the establishment of a 150 million computer laboratory for the school.
It is worthy of note that some old students also contributed some of the facilities used in the computer lab. Mrs. Asempa was later transferred to Aburi Girls Secondary School to continue her excellent work.
Under the administration, the bust of the founder was erected on the fore court of the administration block.
In March 2002, Accra High School was blessed with yet another dynamic headmaster in the person of Mr. E.A. Kissiedu.
Although he has been head for a brief period, he has re-equipped the chemistry and the physics labs, paved the alley in front of the classroom complex, upgraded office equipment sourced new computers for the internet security and constructed of kerbs along the road from the gate to the quadrangle to prevent the perennial erosion.
His interest in the promotion of sports has boosted the moral of sports in Boys and Girls in the school.
He handed over to Mr. Isaac Ohimeng Gyebi who served from 2006 to 2011. The school is currently headed by Mrs Betty Aduhene-Chinbuah who took over in 2011.
Under her leadership, the school is pursuing a redevelopment agenda, with the active support of the alumni (AHISCOSA), to offer the school a facelift and ensure that AHISCO regains its past glory.
Presently, the school runs five programmes, namely: general arts, general science, technical, business, visual art and home economics.
The school also houses a science resource centre, French centre bureau de co-ordination nationale des cref and a completed office complex for the Ghana Education Service Council.
AHISCO, the first secondary school in Accra, is noted for academic excellence, student discipline, sporting talents and excellent marching skills at independence parades.
Source: Wikipedia.com