I think, you need not worry if all your document(history) is genuine. Due to lot of students transferring to Tier 1 from their student visa (and also due to the recent incidents) HO seems to be taking extra precautions. Which is fine. Rest assured if once you are through this extended check and receive your visa, it will be easy for all future application.
Application of various people in this forum are turned down because HO couldn't validate their college/Uni etc.
dtjesus wrote:Switching Student to Tier 1 in UK
Applied : 17-Nov-08
Acknowledgement / payment taken : 25-Nov-08
Wrote a letter to HO and received a reply that says 'Your case has been selected for extended checks...'
Has anybody else had this?