Hi Rohan,

Yes, you have to pay registration fee everytime you have to appear for GRE. You can appear for a maximum of 5 times for GRE in a year. You can register for a new exam only after 21 days of the previous exam. 

Click here to know all about GRE:

https://studyabroad.careers360.com/articles/gre

GRE can be given after every 21 days and upto maximum of 5 attempts in 1year.

For every new attempts registration fees to be paid. 

Early bird iffers available as well. 

All details regarding exam below. 

https://studyabroad.careers360.com/articles/gre