We just had a concrete patio poured adjoining our house.

There was supposed to have been a grade of at least 1 degree away from the
house, so that water would run off towards the edge of the patio, away from the
house.

It seems that they poured it, and smoothed it etc, with no grade, or a slight
grade towards the house.

Is there any way to build up the concrete to create the correct grade?

Or is there another way to fix this?