Can you pass GO backward?
In short - this situation can't arise in Monopoly as long as the normal official rules are being followed.
The text on the chance card says

Go back to Old Kent Road 
Do not pass GO.

Since Old Kent Road is the very first property, there is nowhere you can go back to it and pass GO.
All movement is in the direction of the GO arrow, unless you're instructed to go &quot;backward&quot;

If there are strange house-rules then that's up to the house to decide what happens.