Wifi download speed increasing

Hi guyz,

Im from Srilanka, Im accessing internet through university wifi network, but it has a download limit of 50MB. But somehow i bypassed it by changing DNS settings.

Im using google DNS. But my downloading speed is limited by the network admin.

Can u tell me a method to get high speed downloading?

I searched the google and found TCP optimizer. But it doesnt speed up that much.

I need to download video tutorials. The are large in capacity and i have to spend more time to download them.

thanks