England will now play-off for fifth place on Saturday against Samoa and France - both sides they have beaten this season.
"It was a bit of a performance sandwich with good bits at either end - we didn't like the filling but we loved the bread," said coach Nigel Redman, whose side beat Argentina 17-15 in the group stages.
"We played some of our best rugby of the season in the first 20 minutes in scoring three tries before Argentina had touched the ball. Then we just lost our way for a bit.
"It's the sign of a good side that we were able to get back into the game after a difficult spell when we were disrupted through injuries and scored two god tries. It's a brutal tournament in that respect but it was great the way our lads recovered.
"It's always difficult when you play the same team twice, but on the positive side in the first 20 minutes we emulated what we did in the French game. We got all 15 players involved and when it worked it was terrific.
"It's important now that we stay focused for the final game. There will be lots of distractions but we've got to stay involved.
"If we can win that game, by any standards we'll have had a productive season. We'll have won six out of seven games and lost once to the best team here in New Zealand. Then we'll be able to look at ourselves and say we've given it a pretty good shot."
England Under-19: Alex Goode (Saracens); Miles Benjamin (Worcester Warriors), Alex Tait (Newcastle Falcons; David Smith, Northampton Saints 51), Gareth Griffiths (Bristol Rugby; Greg King, Worcester Warriors, 32), Noah Cato (Saracens); Adam Greendale (Leeds Tykes), Danny Pointon (Northampton Saints; Richard Bolt, Exeter Chiefs 23-29, 42); Billy Moss (Bath Rugby; Jack Steadman, Bristol Rugby 66), Joe Williams (Gloucester Rugby), Nathan Catt (Bath Rugby), Ben Thomas (Saracens; Matthew Cox, Worcester Warriors 48), Gregor Gillanders (Leicester Tigers), Jon Fisher (London Irish), Garth Dew (Sale Sharks; Andy Saull, Saracens, 58), Hugo Ellis (Captain, London Wasps; Tom Denton, Leeds Tykes 70).
Replacements (not used): Alex Corbisiero (London Irish), Scott Freer (Leeds Tykes), Joe Simpson (London Wasps), Tom Bedford (Exeter Chiefs).