The teams travelled to the Eastern European basketball hotbed after completing in the Tri-Nations last weekend.
Dan Petts and Ruth Eytle led the U14 Boys and Girls respectively.
England U14 Girls 49-83 Ras Basket
England U14 Boys 84-96 Beovuk BC
England U14 Girls 41-38 Srem Basket
England U14 Boys 77-52 Quingdao Eagles, China
The U14 Girls had a testing opener in Belgrade with the visitors running out clear winners.
Precious Godwin dominated the England scoring with 17 points, including 4/9 from three-point range with Khyannah Campbell hitting eight.
Ziah Francis led the England effort with 17 points while Oliver Bishop had 13 and Myles Barry 11 as the U14 Boys put up a good fight.
England led by two at half-time but the home side eased to victory in the end.
Khyannah Campbell led the scoring as England's Girls bounced back from their opening-day loss.
The Nottingham Wildcats player was the standout with 13 points.
England Boys also grabbed a win on day two with a comprehensive victory over their Chinese opponents.
Ziah Francis led the way with a 19-point haul while Samuel Muleba (16) and Myles Barry (10) were also productive.
David Akhidime, Manchester Magic
Shujaa Barnaby, City of Birmingham Rockets
Myles Barry, London Thunder
Oliver Bishop, York Eagles
Luca Boothe, Manchester Magic
Ege Cakmakkaya, Manchester Magic
Ziah Francis, Aquila Basket Trento
Jenson Green, Baltic Stars
Camran Hanson, Manchester Magic
Oscar Mahoney, Teesside Lions
Joshua Mboura, Kingston Wildcats
Samuel Muleba, Milton Keynes Breakers
Kimbe N'Gabala, Richmond Knights
Rufus Wilkinson, Farnborough Phantoms
Head Coach: Dan Petts
Asst Coach: Scott Burchnall
Asst Coach: Charles Vuong
Team Manager: Wayne Brooks
Physio: Javid Mirza
S&C: Aiden Griggs
Kyhannah Campbell, Nottingham Wildcats
Chayana Collins-Foster, Richmond Knights
Precious Godwin, Richmond Knights
Katie Hancock, Sheffield Hatters
Elodie de Jonge, Sevenoaks Suns
Ophelia Larder-Lee, Sheffield Hatters
Mojan Malek, Manchester Mystics
Jane Oboavwoduo, Manchester Mystics
Tanaia Robinson, Ipswich Basketball
Joelle Sealy, London Thunder
Tiana Walker, Manchester Mystics
Anya Williams, Manchester Mystics
Summer Wilson, Sussex Storm
Ella Wright, Sheffield Hatters
Head Coach: Ruth Eytle
Asst Coach: Lewis Scott
Asst Coach: Gemma Salmon
Team Manager: Charlotte Redhead
Physio: Chedell Cruickshank
S&C: Lauren Adams