How do I guarantee my firewall will not block Peterson's Test Prep?

Tell the client to follow these steps:

1. Whitelist the following domains: 

• petersons.benchprep.com
• amazonaws.com
• benchprep.com
• cloudfront.net
• google-analytics.com
• googlecode.com
• mathjax.org

2. If the course the client is using includes YouTube videos, they should also whitelist youtu.be and youtube.com.