The field sobriety tests are not designed so that you can pass them easily.
I personally passed one at 4am after a very long wedding party, even though I wasn’t even in a car, or on a public road. I know it’s hard to believe, but the officer tried to get me to say that I met him on the road, although I was pulled into a pasture and no one was in the car when he rolled by.
It didn’t work.