are you just enrolled ikn tafe if so i dont think u can apply for prep.
see
http://www.csu.edu.au/division/studserv/equity/PREP.htm
PREP ( Principal's Report Entry Program)
The object of the PREP Scheme is to attract current school leavers from high schools in the region served by the University who, during their senior high school years, have been identified by their school principal as consistent achievers with the potential to succeed at university study. Year 12 students may be guaranteed an offer of a place in full-time on-campus courses prior to the release of their UAI.
The region served by CSU for the application of the PREP scheme is defined as the northern half of Victoria, the ACT and most regional NSW, except the Sydney, Newcastle and Wollongong areas.
Application forms are available from the secondary school Principal. Applications for this scheme are made directly to CSU and not UAC. For further information on this scheme phone 1800 334 733.