The speed of your broadband is not like a speedometer in a car. It is a maximum speed in good weather with a good following wind 🙂
You need to deduct about 6% as any speed is made up of upload and down load speed, vivid 200 will reserve 12 Mbps for uploads.
There are no really reliable tests for internet speed, partially because even if you enter web address you never go from A to B, but have to go through a series of hops to get there. Each hop cause a limiting effect on your internet speed. Typically in the UK even to get to the Virgin servers a customer will take 20 or more hops to eventually arrive at the target destination, all the hops affect bandwidth. A target server has a fixed bandwidth that is shared between all connected users, sites such as YouTube have thousands of fast networks cards, with very fast storage devices in order to cope with the billions of hits it gets every year, yet at times it appears slow.
If other devices are using your superhub (such as your V6 box, mobile device, or anything else that uses you connection) then your speed will drop.
The important thing to remember is that if your internet is fast enough for what you use it for then the numbers are meaningless, if is not fast enough then increase it.
You can't learn anything from a mistake until you admit that you've made it.
As Adduxi says, the download and upload are separate identities, going in different directions, it's like including a car's reversing speed when quoting a car's top speed.
Most Docsis cable ISPs over provision by about 10% to account for Layer 2 overheads. (and it helps average speed claims)
As advised above you will need to test the speed the speed being received at the Hub by connecting a gigabit enabled device directly to the Hub by CAT 5E or better ethernet cable. Wireless is just too unreliable to test the true speed as it is affected by many factors like client hardware, range, interference. the number of devices using the same wireless channel and the topography of your home.