A low-decile Māori boarding school that bans cellphones has hit the top 10 for University Entrance in this year's high-school league tables.

Decile-2 St Joseph's Māori Girls' College in Napier has come sixth in the list, with 23 out of 24 students in its Year 13 class last year gaining University Entrance (UE) and Level 3 of the National Certificate of Educational Achievement (NCEA).

The Catholic school's head of English, Radne Ardern, a cousin of the Prime Minister, said the school succeeded because of a strict regime including no mobile phones, even though two-thirds of the 213 students are boarders.