What do you think would have possible academic performance of the elementary pupils 30years ago had they used the mother tongue as a medium of instruction in grades 1-3?

If elementary pupils had used their mother tongue as the medium of instruction 30 years ago, it is likely that their academic performance would have been better due to the familiarity and comfort of using a language they speak at home. This could lead to enhanced understanding, engagement, and participation in learning activities, leading to potentially better academic outcomes.