I receive 4464c after I verify my identity

[Michael 1973]

If there's any mistake on computation of filling. Do the IRS will correct it and send my refund. Do I need to wait again another 60 days. 

[Critter]

During processing the IRS catches many errors and corrects them ... all you can do is wait for them to finish processing your return to see if they catch anything.  

[Michael 1973]

So do I need to wait  another 60 days or less to get my refund 

[Critter]

You will need to wait until they are finished with your return and send the refund ... nothing you can do to speed up the process now ... just check  the IRS site every couple of days. 

[Michael 1973]

Thank you