Schools that abandoned the transfer test to select pupils in 2021 do not need formal approval from the education minister for the move, the BBC reports.
That confirmation came in a letter to schools from the minister Peter Weir.
He said he had made the decision due to “the current difficult circumstances that schools are operating in”.
Weir also said the change being for one year only also factored into the decision.
Eleven Catholic grammar schools and the integrated school Lagan College have said they will not use the tests to admit pupils in 2021.
However, the majority of grammar schools will continue to use the tests for admissions.
The transfer tests have been delayed by about two months and are due to take place in January 2021.