Wrong return

NO..  After filling you can not..

You may not revise it. but...you can make adjustment in the next return. if sales is actually high and you have shown less...you can add the difference amount in the next return and vice versa....same is applicable to inputs claim...if excess is claimed....reduce the difference amount from the next 3b return. Hope this will help you.

If you paid tx amount less then calculate interest on remaining amount and paid in next month.

Any adjustments in the 3B return already filed can be done in the subsequent returns..

I have a query relating to gstr1 b2b section . actually there are 2 invoices under b2b but my accountant made some mistake due to which each invoice value in b2b tab gets doubled . the taxable value, cgst ,utgst and total values gets doubled. this happened in the 2nd invoice as well, due to which the tax amount also gets doubled. .this happens in sep gstr1  which has been filed. i found this mistake later when my party showed me the invoices in its gstr2a .now what should I do to rectify this.