Should I reply to emails for grad school that appear to be non specific?
You had taken an ETS-driven exam,already, and let ETS give your email address to the universities... These kind of emails would often be received by many graduate applicants, all over the world...

Hence, you should not assume that these emails are just for you, specifically based on your situation. There are just a bunch of advertisements to catch your attention for potential apply into them.

Furthermore, with due attention to the intrinsic information-based characteristics of these emails, one could assert that there is no need to take any reply into account.