Here’s my comment I submitted a couple of minutes ago at Climb to the Stars on Most People Are Multilingual (cos I’m not sure if my comment wasn’t gobbled):
In southern Africa (Zambia, Zimbabwe, Malawi, SA) most people are multi-lingual with varying levels of language competency in at least 3 languages.
For example in Malawi, children learn English and Chichewa from the first class onwards. Their mother tongue being Chitumbuka or Chisena or Chilomwe. At secondary school level, nearly all subjects are taught in English.