Here's my advice, based on my own transfer to the Regular Army in 1982, after eight years in the Reserve.
It's great that you have some prior service. Don't let that go to your head. While you're going through Recruit and DP1 training work hard, keep your mouth shut, and use your knowledge to help your buddies who aren't doing so well. The staff will quickly see who is squared away and who isn't. Nothing is hated more than some loudmouth former Reservist who keeps yipping off about "Well, when I was in the Humptyville Fusiliers, we didn't do it that way..." Nobody cares what you did.
Mike O'Leary and I know a fellow Inf Offr Candidate who went through with us, but could never keep his mouth shut about his time as a Res Sgt. He had very strong arm muscles by the time the course was over. 'Nuff said. Good luck. Do well. Cheers.