Parallel Park help
So I'm pretty confident with parallel parking except for when there's other cars around. I failed before for doing the maneuver as a car was coming towards me, but I was halfway through the park and he was clearly letting me finish. I have my test soon and I'm just panicking about this, as with my instructor there's been cars behind us as I'm doing the manuever and she's told me to carry on and let them wait. What is the correct way to deal with this? If I'm already parking and a car comes what do I do? Obviously I won't start if there's cars behind me but I'm just getting myself confused about this. Help appreciated :)