At least, there's no layman's way to bypass it.
I'm both a parent, a technologist by training, and a Circle user. My guess is that the poster is looking for low-hanging fruit in terms of an easy, discrete solution, but that doesn't exist. As I see it, the options for bypassing Circle are:
1) Gain physical access to a mobile device that has both the Circle app already installed / set up and has access to the network that Circle is connected to. From there and as others have posted, you can specify that your device or computer not be controlled by Circle.
2) Unplug Circle and completely turn it off, the latter being important because it will be connected to the network via wifi.
3) Do some down and dirty hacking to un-ARP Spoof the ARP Spoof. I'm sure that you're not looking to go down this path, and even if you did, I fully expect Circle to quickly undo whatever you do.
Some mentioned changing the MAC address of your device. Not going to work. Circle automatically takes control of all device traffic on a network only using the MAC address to uniquely identify a device. If you alter your device's MAC address, Circle will simply detect it as a new device and filter its traffic using default filter policies. If you're a child, I might expect your device to be more filtered than the default policy. If you're at least a teenager, probably not, so I don't see a win here.
I think that your best bet is going to be "social hacking". Find an excuse to use mommy's or daddy's phone or whatever device as the Circle app on it. After they unlock it for you, you can use the Circle app to "unassign" your device.