C++ Grading website?

So, i've been wondering is there an online service or website that grades your knoweledge of C++? What I want is to have each c++ subject graded on how good my knowledge of it is so that i can move on to the next, because I have no way of knowing if im doing well or not. So like with arrays and vectors for example, I would be asked to write a program using them in different ways and then be graded on how much of each i know, then i could move on to the next subject like pointers or classes, etc. Does something like this exist or no?
http://lmgtfy.com/?q=C%2B%2B+Testing

or just test yourself. Can you do whatever you want (Within reason) with the subject you are testing? If you want to know how well you are doing with classes, make a simple question game, but use as much OOP as you can (again, within reason). Make tests up for yourself.
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