Assumed the question is for primary school, there are few good schools around:
Non Government School:
* Our Lady of Lourdes Primary School - Seven Hills
* St Anthony's Primary School - Girraween
* Toongabbie Christian School Ltd, Toongabbie, NSW
Government Public School:
* Seven Hills North Public School - Seven Hills
* Vardys Road Public School, Seven Hills
* Shelley Public School, Blacktown
* Toongabbie Public School - Toongabbie
If you live on south side of Seven Hills, my suggestion is Metella Road Public School in Toongabbie.
You can check on http://www.myschool.edu.au for the school profile & NAPLAN test result.
The Hills Sports High School on Best Road Seven Hills, hard to get into tho!