What is solution to make correction in filed gstr3b

Umesh (1) (174 Points)

19 September 2018  

Dear Sir

Please help me out, for solution to correct filed GSTR3B

is there any process to make Correction in GSTR3B
(Excess input taken and carryforward) 

Output Tax Rs 100/-
Input tax Rs 150/- (instead of 120)
Excess C/f Rs 50/- (actual Carryforwad Rs 20/-)

Please guide me how to correct