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Having seen the challenges, more than two-thirds of teachers report no interest in becoming principals, the report shows.

“It’s really important to understand that we’re asking principals to do a lot more with, at best, the same resources,” Mr. Riddile said.

Over the next few years, teachers and principals will face another daunting challenge as most of them implement the Common Core education standards, which have been adopted by more than 40 states. Although the standards have been praised by lawmakers and many others, educators aren’t sold on whether they will lead to dramatic improvements.

Just 17 percent of teachers and 22 percent of principals are “very confident” that Common Core will improve student achievement, and only 20 percent and 24 percent, respectively, think they will better prepare students for college or a career.