Allen Lewis's men travel to the Outeniqua Park Stadium, George for the second game of their three match tour.
A hat-trick from winger Dafydd Howells was unable to stop the young Dragons from slipping to defeat last time out despite a brave second half fightback. And Lewis is hoping his teams' quick style of play will be enough to defeat their South African opponents on Tuesday.
"Last week despite the loss we played with great accuracy and with great power," he said. "To score three tries in the second half was a great reward though we're obviously disappointed."
With the development tour aiming to find the next generation of Welsh super stars, the team are echoing the senior side by playing a quick style of game.
"What we are trying to do is hopefully create players for the future," added Lewis who has had detailed discussions with Welsh assistant coach Rob Howley on the team's style of play.
"The players are trying to play ball in hand rugby, play a quick tempo game and recycle the ball quickly and hopefully this will promote Welsh players for the future."
Saturday's defeat to England saw Wales trail 16-8 at the interval before Howells' hat-trick and a try from fellow wing Ryan Evan saw them come close to securing a shock win.
And after recovering from the defeat, the side are looking forward to the challenge of taking on the young Boks.
"The South Africans are big men and a huge challenge with the ball in hand," said Lewis. "It's going to be a big physical confrontation that's for sure."
Wales U18s (vs South Africa Schools) 15 Hallam Amos 14 Ashley Evans 13 Steffan Hughes 12 Ben Roberts 11 Daffyd Howells 10 Jack Maynard 9 Conner Lloyd 8 Ben Roach (c) 7 Scott Matthews 6 Sion Bennett 5 Lance Randell 4 Josh Phelps 3 Nicky Thomas 2 Ethan Lewis 1 Callum Lewis.
Replacements: Tom Ball, Jack Dunning, Alex Jeffries, James Sheeky, James Benjamin, Joel Raikes, Craig Woodall, Ryan Evans.