01/18/2012 03:45 EST | Updated 03/19/2012 05:12 EDT

B.C. math marking fails to add up

Parents at a New Westminster high school are taking on a notoriously hardmarking math teacher, after it was revealed most of her class are failing Grade 11 math.

They say problems with the math teacher at New Westminster Secondary School have gone on for years and the school district says it is aware of the issues.

Lisa Chao decided to take action when her daughter went from being a grade A student to a grade C student.

"My daughter will say out of a question worth three marks, if you get one small thing wrong, instead of getting a half mark you get zero."

Many of the school's parents have complained but Chao says the resolution process doesn't work.

"The head of the math department is aware, other teachers in the math department are aware, the vice-principal, the principal, all the way up to the superintendent - yet there has been no follow through in addressing what is going on," she said.

The school district says it will have the problem resolved by the end of the semester.