[Cleaned up my previous comments.] According to Ethnologue.com, Namibia should replace Tanzania. English is not a statutory national language in Tanzania. News stories from February 2015 state that the government decided to replace English with Swahili as the language used in schools.
According to Ethnologue.com, East Timor should replace Guinea-Bissau, since Portuguese is the de facto but not the statutory national language of Guinea-Bissau.
By the way, Ethnologue.com cites chapter and verse (e.g., "2002, Constitution, Article 13" for East Timor) for statutory national languages. One gets the impression that they know what they're talking about.
I'm really sorry, but I'm following one source here, and that's this one. It is Portuguese and Tetum for East Timor. And I think that one is Zefyrinus/Quizmaster, they'd update the quiz if anything major happened. :)