Well there are a few different types of proxies. Some picked up by blockers more easily than others. But realistically, you want one that is constantly updated so the second it is found to be blocked it is taken down. I would definitely recommend:

[url]http://www.mathsmadeveasy.org[/url]

As on this site it has an app which chooses the best proxy in terms of bandwidth and people using them. There are over 5000 proxies built into the app so that you are sure to get the fastest and best proxy every time, automatically

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