Aitchison College has also changed its building make-up over the years. A separate building for the Preparatory School, which now holds classes for grades 7–9, was constructed in 1915, and the prefects system was established two years later. The school became affiliated with Cambridge University in 1933. In 1935, the policy of admission was broadened to include ordinary boys from surrounding areas. Following this policy, a separate house, Jubilee, was established for day boys. Classes for grades 9–13 were shifted from the main building to the newly constructed Barry Block (Senior School) in 1948. Following the independence of Pakistan in 1947, Muhammad Ali Jinnah was appointed Patron in Chief of the college in 1948. A separate building for Junior School, for Grades 1–5, was built in 1964. War between India and Pakistan in 1965 disrupted school activities for a while but normal school year resumed soon after cease fire. A number of modern buildings were constructed on the campus near the end of the 20th century, including an amphitheater, a large library, computer and science laboratories, housing for staff members, a riding school, and squash and basketball courts.