Points for Previous Earnings(doubts)

Dear form:
I have got question to ask that I am on Student visa since September 2003.
since then I have finished one Postgraduate course on 1st of March 2006 and started another on 4 the April 2006. I am going to show my previous earnings prior to my full time study. but I have this one month 4 day gap from 1st March 2006 to 4th April 2006,during that one month gap I was in the country on student though. can I still show my previous earning prior to my full time education.
I have got wage slips covering period from July 2002 to June 2003 and Income Tax Return (any 12 month out of 15 prior to your full-time study as per guideline).
any advice on this will be appreciated

plz say something about aforementioned...