As we all well know, schools need our financial help. A Parcel Tax is not the way to do it. For one thing a parcel tax with same amount per parcel is not an ad valorem tax and therefore not deductible as a real estate tax.
Donations are deductible though. PPIE has a giving fund which is tax deductible.
A better way though is to do what is done in the State of Arizona.
In Arizona they have a State Income Tax credit for school donations which is deductible at the Federal level and is also directly applied your State Income liability. You can even designate a program within a school or just the school for your donation.