Grammar schools in Northern Ireland today began registration for unregulated entrance exams to replace the 11-plus.
There will be two sets of tests with different content but both organisations have co-ordinated timings for the assessment.
Both have begun taking applications, with a closing date of September 18. Pupils will receive their results in the first week of next February.
The Association for Quality Education (AQE) is charging £35 although pupils receiving free school meals will not be charged.
The Post-Primary Transfer Consortium, mainly Catholic grammar schools, will not charge.
The organisations' tests are based on English and maths being taught in primary schools.
Catholic teaching unions and Education Minister Caitriona Ruane have warned members not to coach for the exams and highlighted the threat of legal action.
Application forms can be downloaded from school websites, requested by post or collected on grammar school open nights.