N.Y. Education Law § 2573
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(b) Qualifying eligible lists for teaching and supervisory positions shall consist of the names of all persons who have met the eligibility requirements for appointment as defined by the chancellor pursuant to sections two thousand five hundred ninety-j and two thousand five hundred sixty-nine of this chapter. Where the regulations of the commissioner do not identify a state certificate that corresponds to a license utilized by the city school district, the chancellor shall develop and administer an examination appropriate to the license, provided the development of such examination and the passing score are based upon appropriate validity studies conducted in accordance with professional standards of measurement. For teaching service positions, competitive eligible lists in existence on the effective date of this paragraph shall not be merged. Subsequently promulgated qualifying eligible lists in the same license area shall be merged so that there shall be one qualifying eligible list for each license area. No candidate shall remain on the qualifying eligible list longer than seven years from the date the candidate is placed on the qualifying eligible list. This paragraph does not affect the examinations for teaching or supervisory service positions announced by the board of examiners prior to the effective date of this paragraph.