Can we resubmit income tax return before due date?

you are required to file a revised return by simply filling up with correct particulars in the revised return.

And as you have submitted your return in due time you can revise your return for indefinite times before completion of assessment.

Mahesh Garg had given perfect answer. Above details are correct without any doubt.

Thank you all.

One more doubt... Whether I have to send both ITR-V forms (Original and revised)to CPC (Bangalore) or only I have to sent the ITR-V form recieved after submitting the revised ITR-1?

yes u will have to sent the ITR-V form recieved after submitting the revised ITR-1

Dear Neeraj !

I would like to inform you that you can file a ‘revised return’ immediately as you have submitted  the return in time.

The pre and foremost condition to file the revised return  is, that the ‘original return’ must have been filed in time as per the Income-tax Act.  

There is no separate form for the revised return. You can use the same type of return form wherein you are supposed to give the e-filing acknowledgement number of ‘original return’ and date filing such return.

It is to be noted that you have to send ITR-V to Bangalore  relating to the ‘original’ and ‘revised’ returns in time without fail.