North West London St Helen's School St Helen's School is an independent day school for girls aged 3 to 18. Day Girls Pre-Prep Prep Senior Over 1,000 pupils Contact Details Eastbury Road, Northwood, HA6 3AS www.sthelens.london More pre-prep and prep schools in North West London Quainton Hall School University College School View more North West London schools. More senior schools in North West London The John Lyon School University College School View more North West London schools.