Gwynedd council's cabinet discussed a £9.27m overhaul of schools in Bala over falling pupil numbers at a meeting on Thursday.
Ysgol Beuno Sant, Ysgol Bro Tegid and Ysgol y Berwyn could close and make way for a school for three to 19-year-olds on the site of Ysgol y Berwyn.
There is also a proposal to amalgamate control of Ysgol Bro Tryweryn, Ysgol Ffridd y Llyn and Ysgol OM Edwards.
The cabinet approved plans to open consultations ahead of a final decision in September.
The new campus could open in September 2018.
Plans to close three schools in Gwynedd will go out to consultation.