Education Minister Kirsty Williams said it was impossible to guarantee a level playing field for exams due to the ongoing impact of the Covid pandemic.
Head teachers would work on a "national approach" to ensure consistency, she said.
Assessments will be done under teacher supervision, and will begin in the second half of the spring term.
They will be externally set and marked but delivered within the classroom.
Policy Editor Lewis Goodall reports and Emma Barnett is joined by Conservative MP David Simmons and Hampton High Headteacher Rebecca Poole.
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