Pretty much everywhere he’s been, Robbie O’Gara has won and won big. This past season with Yale, the 6-foot-4, 205-pound defenseman helped the Bulldogs win a national championship. Two seasons prior, O’Gara led Milton Academy to a NEPSAC title as a junior. But while the Bruins organization is hoping the Nesconset, N.Y., native can eventually bring that same winning pedigree to Boston, for now O’Gara just wants to improve. And after spending a week at his third B’s development camp, O’Gara has grown out of the “Bambi stage,” as assistant general manager Don Sweeney cracked. “Well, he’s not Bambi this week,” Sweeney said of O’Gara, who was chosen in the fifth round of the 2011 draft. “First camp, Robbie came in and as a kid coming out of prep school, he shot up and grew a lot and now he started maturing. You can tell, he played a year of college hockey, won a national championship. He’s confident in himself. His game’s continued to evolve. He’s getting stronger and growing into that size. “It was a really good week. And I talked earlier about the progression that we judge kids on, evaluate kids on and when we first see them vs. eventually when they get to the pro level. He’s still got a couple more years to continue on that path of getting stronger and honing his game.” O’Gara described his first year at development camp like he was “a deer in the headlights, definitely. “I was like, ‘Wow, I’m happy to be here. I don’t expect much out of myself,’ ” O’Gara said. “But as the years go, you want to show more. I want to show what I’ve got, how hard I’ve worked. I think that’s where the mindset has really changed. I’m here, I want to do my best. I want to show everyone that I have gotten better and that I am progressing moreso than I’m just happy to be playing with these guys.”