Mrs Tolley said there were vacancies at some academies so it made sense to spread the opportunities around.
"We don't want them to have places they're not filling ... We have some flexibility in the budget to enable us to double [the number of new academies next year] to 10 and get more more places for students from the same amount of money."
The number of extra places would depend on each academy but doubling the academies did not mean doubling the number of students, she said.
At the moment there are about 700 students in academies nationwide. Four more academies should be up and running by the end of the year and 10 more next year should mean a total of about 2000 students in the academies.
The Labour Party has questioned the effectiveness of Youth Guarantee, but Mrs Tolley dismissed this, although she did not have figures to hand.
"They've only been going six months, but the retention rate and [NCEA] achievements to date show they are extremely effective, so they're keeping the kids in the school system.
"Schools are really pushing for it, and it gives them much more flexibility in terms of how to deal with some of these kids, so it can't hurt."
She said it would be a couple of years before any meaningful data was available on how many students went on to work, apprenticeships or other courses.