Below are some of the better online free test sites I found. Some may require entering registration information but all of them you can use dummy names/email addresses etc. as they don’t require activating from your email or anything. I hope you find these useful.
https://www.cnsvs.com - This one requires downloading software, but the most thorough of them all. You can try out the software here which does 2 of the tests...http://www.brainfitnesscentersofflorida ... enu-item-7
http://gocognitive.net/demos
http://cft.foodforthebrain.org/
http://www.cambridgebrainsciences.com/
http://www.memorylossonline.com/learnin ... ames1.html
https://www.mindcrowd.org/