Have CDL A permit - am I eligible for a CDL B road test directly ? New York

They will want the actual license. A permit only allows you to drive under the supervision of a qualified operator.

 

You cannot legally drive on just a permit alone. A full license holder has to either drive the truck, or be in the passenger seat.
This is fairly basic stuff. If you don't even know that what makes you think you can pass the test?
Have you even read the cdl manual?
Do you know all 120 or so points to inspect for that section? Or the criteria for the maneuvers portion?
It's a bit more complex than just renting a U-Haul and testing in it.

I'm not trying to be discouraging. I'm just saying that you need to know what to expect. Otherwise it's just a waste of time and money.

 

Make sure you test in a truck with air brakes, otherwise DMV will give you a CDL allowing you to drive only trucks with no air brakes.