A new international study ranks Canadian students among the top of the class in some key subjects, but Manitoba did not fare well among provinces.

More than 500,000 15-year-olds from 65 countries were tested in the 2012 study by the Organization for Economic Co-operation and Development.

In Canada, 21,000 teens from 10 provinces took part.

The Canadian kids showed above-average scores in math, reading and science on the international stage.

Among Canadian provinces, however, Manitoba ranked 8th in math, 9th in science and 9th in reading.

Teachers at Sylvan Learning help students with math, reading and studying skills. Suzanne Parker from the centre says some kids get left behind in schools.

"The curriculum just isn't being met in the classroom. And students are being moved from class to class without meeting the goals they require," said Parker.

The province's education minister said he's heard from parents concerned about Manitoba's ranking. He promises improvements are on the way.

"The kinds of things we're doing, through the class size initiative, by reviewing our curriculums and by working more directly and closer with parents, will make sure those outcomes...are where we want them to be," said James Allum.