What are the thing to keep ready for revice return of tds?

You have to download Consolidated File from the TRACES website. After downloading import the file to the software and make the changes you want.Note for changing PAN and Challan Details you can file an Online Correction Request on the Traces Website but for that you have to register the Digital Signature.

sir,

 If i donot have Digital signature then by downloading the consolidate file can i submitted the return.As i made a mistake in my pan for the FY 2008-2009.So i want to revise for the same.

challan with atleast 3 pan and tds amount of deductees corresponding that challan to download conso file.

Yes you can Revise the return offline by downloading the Consolidated File .

what if i have lost the challan for the same FY 2008-2009.And at the time of registering in TRACES AN INVALID DETAILS IS shown what is to be done.

For any Financial year before 2013 you have to have DSC registered on the TRACES Website.No other option.