Dear candidate, hope you doing well.
As per the guidelines given on the official site there is no such rule written. But it's better for you to try to remove it before going to the centre. Every center have another level of strictness. So it's better to avoid things like this.
Check the link below for more information
https://university.careers360.com/articles/cpget-exam-centres
All the best
Counselling | Application | Admit Card | Exam Pattern | Answer Key | Result | Eligibility
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile