Hi Annalia &

to the forum or should I say "big" family
Go to
www.tki.org.nz and on the top right select "schools". Then find Wanganui and have a lot there.
The ERO reports that you'll find on schools will give you some idea of what they're like. NZ schools are rated by Decile - 1 being the more dependent on the government for funding while 10 being the highest and less needy of government funding.
There's also a section in the ERO report that will give you your ethnic population.
When chosing schools here we relied on the above,
www.schoolzones.co.nz as well as google maps - this helped us to find the best areas/school as most of your schools work according to school zones.
Good luck and hope this has been of some help to you.