Texas A&M, College Station vs University of Southern California for MS in Data Science

I have received admits from both TAMU and USC for MS in Data Science and MS in Applied Data Science respectively. Which

Duolingo English Test

Are we allowed to use external mouse in the test? And is it compulsory to use passport for identification?

I've received my IELTS TRF i got l=8,r=7, w=6, s-7, overall band=7

Should i try for one more attempt or go ahead with this score?

I attended the webinar session but i didn't get application fee waiver code....please provide the code

I attended the webinar session but i didn't get application fee waiver code....please provide the code