Fresh concerns have been raised over National qualifications by the Mathematics Advisory Group in Scotland in a letter to Education Secretary John Swinney.
Experts have claimed that the latest overhaul in maths is making it harder for pupils to pass. Teachers have said that there is too big a gap between National 4 and National 5 for pupils to make a transition.
The reports today follow similar complaints from modern studies, geography and computing teachers.
The Scottish Conservatives have called for a review of the SNP’s flagship Curriculum for Excellence policy.
Education spokeswoman Liz Smith said:
"This is further proof of the hopeless confusion that has become the hallmark of the delivery of the Curriculum for Excellence under the SNP.
“These concerns from maths teachers echo those of modern studies teachers, geographers and computing teachers all of whom raised their own concerns with Holyrood's education committee in recent months.
“Meanwhile, John Swinney tells us that there has been significant progress in education and that opposition parties should stop complaining.
“Perhaps he should start listening to teachers to find what is really happening in our schools.
“These latest concerns demonstrate just how widespread teachers' concern is and the lack of trust in the SNP's education agencies to effectively manage the Curriculum for Excellence."