Goals from trialist Bilel Mohsni and Brice Ntambwe helped Blues to their third win in four games.
“Three wins out of four is very good,” said development coach Beale.
“Winning becomes a habit and the boys have worked really hard since last year and taken things on board.
“The biggest thing is their mentality and approach to their work.
“Of course it’s a developmental process so they’re going to make mistakes. But it’s about making sure that every time they cross that white line they give 100 per cent, are switched on and apply themselves to their job which they did against Forest.”
The game was watched by Lee Clark and his management team, and Beale said their input definitely benefited the players.
“It was fantastic for the boys that they had the manager and all his team watching the game and taking such an active part in their development,” he said. “That can only give them a massive boost.”
Included in the starting line-up were two trialists – former West Brom and Bolton defender Paul Robinson and Southend’s Bilel Mohsni.
Beale felt that they both acquitted themselves well.
“Mohsni was a handful,” he added."He missed a bit of pre-season so he’s not quite fully there in terms of fitness but he didn’t lose a header all game and used the ball well.
“Robinson played as the left-sided centre half was excellent.
“He was a great example to the young players in how to go about your business and showed why he’s had a good career.”