Mac: How Do I Know If I Can Use My Version Of OS X To Access The Tests?

If you want to know what OS X version you have: 

1. Go to the top left corner of the screen and click on the Apple Icon 
2. Click on About This Mac
3. Under the apple icon it will say what version you have (ex. 10.12)
4. Versions 10.9 and above are supported 

What internet browser can I use to access the test? 

Google Chrome, Safari, or Firefox 

I only have Safari as my browser, how can I download Firefox? 

You can download Firefox for free here.
You can download Google Chrome for free here