N.J. Stat. § 18A:35-19.1
A pupil enrolled in a bilingual education program pursuant to P.L. 1974, c.197 (C.18A:35-15 et seq.) shall be placed in the English-only program when the pupil demonstrates readiness to function successfully in the English-only program. The process to determine the readiness or inability of the individual pupil to function successfully in the English-only program shall be initiated by the pupil's level of English proficiency as measured by a State established cut-off score on an English language proficiency test and the readiness of the pupil shall be further assessed on the basis of multiple indicators which shall, at a minimum, include classroom performance, the pupil's reading level in English, the judgment of the teaching staff member or members responsible for the educational program of the pupil, and performance on achievement tests in English.
N.J.S. § 18A:35-19.1