Explanation

The Constitution of 1962 was promulgated by President Ayub Khan on 1 March 1962 and finally came into effect on 8 June 1962.

Presidental system of government was introduced in 1962 constitutions
Urdu and Bengali Was The Official Language Declared In the 1962 Constitution
Iskandar Ali Mirza, the first president of Pakistan abrogated the constitution of 1956 on 07-October-1958.
Ayoub Khan was made chief of martial law after this abrogation
Ayoub Khan enforced the new constitution on 8th June 1962
Yahiya Khan abrogated the 1962 constitution and became CMLA