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The actor said the film's producers had ensured everything was "stepped up" in the third instalment of the Disney franchise.
"It felt like the first two movies all over again," Efron told People. "We just kind of can't go wrong with Kenny Ortega as our director and leader and our great cast and crew.
"We've got no squabbles to get through."
He added: "Everything's been stepped up a few notches, all the dances, and I think the songs are pretty catchy this time around.
"And it's our senior year, so we've got graduation and prom to look forward to. All fun things to have in a movie."
High School Musical 3: Senior Year is released in October.
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At the Movies
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Max von Sydow 'Extremely Loud' interviewActing legend Max von Sydow on Extremely Loud & Incredibly Close, The Exorcist and Flash Gordon.
Box Office Charts
'The Woman in Black' wins UK box officeThe Woman in Black beats The Muppets and Star Wars at the the UK box office.
