The Scottish Secondary Teachers' Association (SSTA) said members have been calling for a boycott after the Scottish Qualifications Authority (SQA) announced plans to reintroduce assessments and coursework scrapped during the Covid-19 pandemic.
The exams body, which is set to be replaced in an overhaul of the education system, said on Wednesday the assessments would return in the next academic year.
The SSTA accused the SQA of pushing the announcement out while the focus was on the appointment of new First Minister Humza Yousaf this week, and while teachers finish exam and assessment preparation before schools close for the Easter break.
SSTA general secretary Seamus Searson said the move was "bad news" for all secondary school teachers and the young people they teach.
He said: "I am absolutely astounded by this message from the SQA. The SQA needs a reality check as it has totally misread the situation in secondary schools."
