OSS Education Should I book my GRE exams through OSS education which provides discount vouchers?

I'm a working Professional and I haven't yet started preparing for gre. Can I still get admission into a good American University without IELTS as well ?! I have good gpe and working in a good produc...

Does anyone have application fee waiver codes for any of the following universities for MS in CS?
Cornell
UNC Chapel Hill
UNC Charlotte
Virginia Tech
Texas A&M
UT Dallas ...