Am I able to change my GPA once I submit a graduate school application? I am wondering if I apply to graduate school in US in fall and lets say the due date to submit the application is December 1 and fall quarter grades are posted two weeks after that. Now I am wondering am I be able to update my GPA after positing the fall quarter grades,which is after submitting the application?
I think it really depends on the school you are applying to:

You can call their administration that you would like to hand in recent new transcript, or just send it to them and hope they accept (it should certainly not be a bad thing to do it).