Hi haminka1.My three children attended St Oliver Plunketts Primary School situated on the Proudstown Rd near Blackcastle. V good school.My youngest is leaving this June to start Secondary.St Pauls at Abbeylands is also quite good.It depends whereabouts you live in Navan.If you live more central there is St Annes near the church.The best advice is to ask around.Your friends,neighbours etc and get some feedback from them.
Good luck