Great quiz idea, but I wouldn't call Republic of the Congo just Congo. You might have to put the entire name there, because ROC would get confused with Taiwan.
Angola should be much higher. The former president Jose Eduardo Dos Santos embezzled and stole millions from the Angolan people. Even though the country is one of the poorest in Africa, Dos Santos's daughter was in the top 3 most richest women in the continent. Also he recently passed away and his children are still trying to use his death to for political leverage against the current president Joao Lourenco.