No need to worry about it. You will get a scope to correct your profile photo as well as signature during the correction time period as offered by most of the examination after the last date of form fill up and before the releasing of admit. So keep an eye on the official website and you will get the notification about the correction page.

To know more about GUJCET visit the link below:

https://engineering.careers360.com/articles/gujcet

I hope this answer helps.