ANSWER:

Since you are in UAE, you can complain to authorities about this.

In sha Allaah action would be taken like how the restaurant in Bahrain was closed due to a similar incident.

Either way, you must not take off your abayah for such a reason! What is left of our Islam if we compromise our chastity and hijab? 

i’ve been wearing abaya since 8th and now I’m in 12th and live in uae.. for 2 exams we will have from indian board people as invigilators and they said they wont let me write exam if i wear abaya for exam.. i don’t wanna remove my abaya and im afraid they wont let me attend the exams .. sheikh can u pls advice me what should i do?