I can't get past Bronze I, what am I doing wrong?

So I have been climbing well in bronze since March, except mid-april to mid-may; http://i.imgur.com/NHcYm7j.jpg Now i'm NOT blaming my teammates nor do I expect anyone to carry me through the ranked system. This is a very important point. What I think is happening, and what one of my friends who's in mid-silver have told me is that i'm not aware of my own mistakes. This way i'm making the same mistakes over and over again without even knowing what i'm doing wrong. I place wards, I watch the mini-map as often as I can, I CS as much as I can, and yet I still can't get promoted to Silver V.... I would greatly appreciate if you would watch the gameplays I have uploaded publicly to Youtube, and point out my mistakes. What am I doing wrong, what am I doing right, what do I need to get better at so that I can climb further in the ranked system. Top: https://www.youtube.com/watch?v=_qj_kyu2P9c Mid: https://www.youtube.com/watch?v=TR1msZ7Pcoo ADC: https://www.youtube.com/watch?v=g780oaH9NkY
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