Priestley won all eight league matches racking up big victories over Warrington Collegiate, Winstanley, Oldham, St Helens, Carmel, Cowley, Wigan & Leigh.
Ben Walker, who captained the team with his twin Luke, paid tribute to the team’s younger players.
“The 16-year-olds came through and really stepped up,” said Ben, who is 18 and studying BTEC Sport.
“We trained hard and got to know one another and as soon as we started playing like mates we started to win.”
In their first match together – a pre-season friendly – the team were defeated, but learnt from the loss.
In winning the U19s College Rugby League NW Conference, Priestley scored 219 points and conceded just 78.
Among the star performers throughout the season were Danyal Rasool, Luke Walker, Ed Chamberlain, Ross Young and Miguel Panis.
Ben Walker, a former William Beamont pupil, said: “A week after that loss in the friendly we went into the league and haven’t lost since.
“Everyone has worked hard and had a lot of enthusiasm so I think we deserve the success we’ve had.”