Students in NSW will not sit NAPLAN tests online until schools are confident they are ready to move from pen and paper, according to the Education Minister Rob Stokes, who said he supported the use of handwriting in exams and was "very aware" of the concerns of teachers.

Mr Stokes' comments come as the NSW Teachers Federation began collecting feedback from teachers and principals about the school readiness tests, which are under way in thousands of schools across NSW to assess whether schools will be in a position to move to online NAPLAN testing from next year.

Educational research says there is no link between high-stakes tests and improved performance.

The federation's vice president, Denis Fitzgerald, said the organisation had been receiving complaints since the practice tests began last week. They run until September 22.

The responses, which cannot be anonymous to ensure they can be verified, include complaints of schools not having enough computers, unreliable Wi-Fi and the disruption to classes.