The two sides will meet in the quarter finals of the continental tournament after the Ghanaian scraped through by beating Burkina Faso.
Ghana has been decimated by injuries to several key players and many youngsters in the team are playing their first tournament.
They improved their performance to beat Burkina Faso after being beaten 3-1 by Ivory Coast – which led many to dismiss their chances.
But Italy-bound midfielder Badu says they will continue to fight to prove their critics wrong to firmly in the driving seat.
“We will fight for every ball again and hopefully we will surprise the Angolans because not many people are giving us a chance,” Badu said.
“We will relax and play football. We will not allow the pressure to get to us.”
Ghana will reach the semi-finals if they beat Angola.