Nigeria’s Golden Eaglets drew 1-1 with the Uganda Cubs in a Group A match at the Chamazi Stadium in Dar es Salaam.
Angola were 4-2 winners over Tanzania’s Serengeti Boys at the National Stadium.
All four semi-finalists from Tanzania also earn a place at the World Cup in Brazil later this year.
A goal from substitute Alou John Kokasin gave Uganda the lead against Nigeria who equalised through Ibrahim Jabaar.
Angola’s convincing win against the hosts came courtesy of a brace from Pedro Osvaldo while Leson Tome and Davide Nzanza were also on the score-sheet.
Omary Omary and Agiri Ngoda scored for Tanzania.
Five-times U-17 world champions Nigeria finished top of Group A with seven points, while Angola finished second with four points.
The two teams will join Cameroon in the U-17 Nations Cup semi-finals, after Cameroon sealed their qualification from Group B on Thursday.
The last group B games will be played on Sunday with Cameroon facing Senegal and Morocco battling Guinea.
