As a reasonably affluent community who donate substantial sums to Tzedokoh, are our schools not already receiving a significant amount of support?

As a reasonably affluent community who donate substantial sums to Tzedokoh, are our schools not already receiving a significant amount of support?
Chomesh L'Chinuch

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Unfortunately this is not the case. Our research indicates that over 80% of our NW London community give less than 10% of their total Tzedokoh allocation to local schools (excluding fees). Given our schools’ £7,000,000 annual shortfall, this share is clearly far too low and damaging the chinuch of our (grand)children. If everyone in the NW London community was to donate 20% of their Tzedokah to our schools, this would significantly address the annual shortfall and enable us to deliver the best chinuch possible to the children in our community.