Carol Bartz gives herself a B-minus in her first year as chief executive officer of Yahoo! Inc., saying she could have moved faster to reorganize the company and strike a Web-search agreement with Microsoft Corp.

“It was a little tougher internally than I think I had anticipated,” Bartz, 61, said in an interview at Yahoo!’s headquarters in Sunnyvale, Calif. “I did move fast, but this is a big job.”

Bartz, who marks her one-year anniversary as CEO next week, is striving to keep 15-year-old Yahoo! relevant in the era of Twitter and Facebook.