The issue centres around the 'substance' of the education provided and not the disparity in the method of delivery or the medium of delivery.
A single method of delivery can only exist (theoretically) in a commune base society. Communism showed that such a method is unfeasible and ultimately prone to systemic rot. In a country dominated by muslim thought, a singular method of delivery is unfeasible, unwanted and incorrect. Having different delivery systems based on financial disparity of the people is not something to avoid, but to regulate.
As for the medium of delivery, that should be localised. Only colonies and perpetual slaves retain foreign mediums of education, free people do not. English, Mandarin and French have a place of prominence within international commerce. Spanish, German, Russian and Portuguese have an influence as well. With a population of 40 million under the age of 19 a fair Pakistan should have groups of students who can converse in all of these languages. Persian, Arabic, Turkish and Malay should be in larger proportions too. However these languages should be taught as "additional" languages and not the 'medium' of education. (Japan, Germany, France, China, Turkey etc too many examples to quote).
Now to the 'substance' aspect i.e. This is a far more important matter and is absolutely essential to overhaul in Pakistan. This would mean a singular and mandatory syllabus for the basic, primary, secondary and high school education. Conditions upon public sector employment and representation can be placed based upon such a syllabus. (Example, no government employee or representative will be accepted after 202x unless they have studied under this syllabus).
A comparatively small amount of intellectuals can achieve this task and an even smaller number of peer elected members can maintain it. Pakistans higher academic institutions and diaspora have the expertise required.