New York City's worst school

Sills did not come to school last Monday. On Tuesday, she showed up at 3:30 p.m.

On Wednesday, The Post found her at home in Westbury, LI, all day before emerging at 2:50 p.m. — school dismissal time. Wearing a fur coat, she took her BMW for a spin.

She showed up at school Thursday, but not Friday.

When Sills, 48, does go to work, it’s rarely before 11 a.m. — and often hours later, say sources familiar with her schedule.

“She strolls in whenever she wants,” one said.