Question

what was the aim of the French with the introduction or as a medium of instruction

Answer 1

A medium of instruction (plural: usually mediums of instruction, but the archaic media of instruction is still used by some) is a language used in teaching. It may or may not be the official language of the country or territory. If the first language of students is different from the official language, it may be used as the medium of instruction for part or all of schooling. Bilingual or multilingual education may involve the use of more than one language of instruction. UNESCO considers that "providing education in a child's mother tongue is indeed a critical issue".[1]