"It's helping me more than anything," Tarczewski admitted. "He's great. We don't do too much of the athletic stuff with him. We do more skill stuff. It's going really well. Working out with him has changed me as a player."
To go with his normal practice routine at St. Mark's, Tarczewski works out with Carroll and teammates Alex Murphy three times a week, focusing on his skill development.
"I've been working every day," he said. "Alex's dad, Mr. Murphy, has been working with me on it. Coach Carroll has been working us out. I've been really trying to get comfortable."
"Offense has always been a problem for me so I'm trying to get my footwork down and it's really been working," he added.
Offense isn't much of a problem anymore. Tarczewski is developing his post skills and is much more comfortable making scoring moves on the block or stepping away for a mid-range jump shot.
Tarczewski proved just that on Saturday in a match up with Lee Academy, scoring 25 points and reeling in 10 rebounds. But that wasn't enough for the post prospect.
"I wish I could have played better," he said after the game. "I wish I could have rebounded a little better. There were a couple of possessions when I was on the strong side instead of the weak side where I should have been to get the rebound.
"On defense I could have rotated a little quicker," Tarczewski added. "Offensively I did OK. I missed a few easy shots, but it's just the first game."
Kansas had a pair of assistant coaches watching Tarczewski at the National Prep Showcase. But they are far from the only school showing him strong interest.
"Most every school in the country has offered," Scout.com's No. 12 prospect in 2012 said. "I'm kind of waiting on Duke and North Carolina for sure. Other than that I'm starting to figure out what I want. Hopefully I'll have a list coming out pretty soon."
"I'm still kind of looking," he added. "I got into everything pretty late. I'm just trying to take my time and have fun."
Although North Carolina has not offered, he has spent time talking with their coaching staff on the phone.
"They've been interested," he said. "I've talked to a few of their coaches. They were at the open gyms that we had and they send me letters every now and then. I think they are interested - just haven't offered yet.
"They just said that they are going to keep watching me and they said I have a lot of potential."
Tarczewski doesn't have any visits planned, but made it clear that he wants to get more serious about the recruiting process.
"I'm trying to get into the process a little more and take some visits, but it's kind of hard because at our school we have a half day on Wednesday and a half day on Saturday so we don't' really have the opportunity to get out of school too much."