The Calgary Board of Education says its students measure up well in achievement tests and diploma exams.

It says students in grades 3, 6 and 9 outperformed the provincial numbers both in acceptable and excellence standards.

In addition, marks improved for Grade 12 diploma tests over last year.

The CBE says the marks for biology, chemistry and physics were exceptional, but students in Science 30 aren't doing as well as expected.

The board is now trying to find out why.