mistake in GSTR 3B

Mayank Gupta (370 Points)

26 October 2018  
I made a mistake while filing GSTR 3B for September. The total tax amount was 67 but i accidentally entered Rs 57.

What should i do now? I believe that mistakes should be rectified in next month's GSTR 3B. But before that I have to file quarterly GSTR 1. How should I go in GSTR 1? And what penalty would I have to pay?