The Prospective Student visa route closed on the 1st October 2013. No further applications are able to be made under this route.
Student who currently hold a Prospective Student visa are reminded that they must switch into the Tier 4 (General) visa category as soon as they have registered for their degree programme.
You can find more information on applying for a Tier 4 (General) visa on the following web pages:
How to make a Tier 4 (General) student visa application