input credit

Yes.... It's possible to Take.

sir last 3monthes ago I didn't taken some invoice s so I am claim in this month....so plz tell me.....sir

Yes... You can take ITC if You deal Taxable Supplies...

Yes agree with Raja sir.
ITC can be claimed only within one year from the date of issue of tax invoice relating to supply. In any other case, the last date to claim ITC is earlier of the two below:

Before the filing of valid return for the month of September following the end of FY to which such invoice is related, or Before the filing of the annual return

Note: As per section 44, the last date for filing of annual return is 31st December following the end of the financial year.