I don’t know any of those sites, but it’s very difficult for anyone else to judge what level of knowledge you might have. I’m learning PHP, and what I tend to do is read through posts on here when people ask questions, and see if I can see what the solution might be. Doing that gives you an insight into a much broader range of programming techniques and requirements, and may bring you into contact with far more than reading a book and doing a couple of exams. Very often when the more experienced posters add a response, it opens up a whole new train of thought that I hadn’t considered.
Another thing that I can’t tell from your description of your experience is how the book and those exams have helped with your problem-solving ability, which is sometimes quite different to any kind of programming knowledge. That would be something that would add values to your services, I would think.
One thing’s pretty sure though - the more you do, the more experience you’ll get and the more useful that will make you to potential employers. Obviously that’s not guaranteed - some people seem to do things over and over again without any signs of improving at them. But usually experience brings improvement.