My kids both went to Shepherd of the Valley near Platt and Kittridge. It's a Lutheran school that goes preschool thru 6th grade. It's a caring community, they are WASC accredited and they education is excellent.
My son now goes to Ivy Academia. I believe they have a preschool campus in West Hills or close. They are an entrepreneurial charter school and also has an outstanding curriculum. They are preschool through high school and have 4 different campuses depending on the grade level.
If you have any questions, please don't hesitate to contact me.