I believe the appointment is to pass the requirements/documents, interview by the british embassy will follow when needed and you will be informed about it. the documents needed is actually listed on the vfs website, and i guess you may have heard that come end of march, it will be point system now. during my time last dec, some of the documents i passed includes, my tor/diploma, the certificate of enrollment from the school of UK,accredited by DIUS,letter/affidavit of support from my sponsor,ITR of my sponsor,bank statements and bank certificates,business permit,dti permit,the letter from my school's accomodation, and of course the student visa application permit and my passport.
if you have further questions go to this website http://www.vfs-uk-ph.com/applying.aspx
Goodluck, i hope this helps
