I am on F1 VISA status.
I worked on campus.

For the year 2008, I filed 1040A form and I got my total tax refund.
For the year 2009 , I filed 1040NR -EZ and got only partial refund.

I think I made mistake for 2008 by filing wrong for,no how can I correct that before filing 2010 tax returns.

Pleas suggest what should I do now.

File nonresident tax return with Form 8843 for 2010.
For amending your 2008 tax return you will file form 1040X with properly done nonresident tax return and form 8843.

Thank you Mukat.

Its been very complicated to correct my mistake, I am in two states in year 2008, I have filed 1 federal (for both Tx+IL ) form and state tax form (for IL).
So now do I need to send 1040 X along with correct form for two tax filings ?