ucfdiver
Contributor
If you google the site address, you'll find people saying it's a scam. I took the SSI course, take home materials, study them, and go in to take the test after a review with an instructor.
This site helped me the most with my Nitrox understanding, but covers a lot more than the SSI test.
DIR-diver.com - Nitrox Class Part 1
This site helped me the most with my Nitrox understanding, but covers a lot more than the SSI test.
DIR-diver.com - Nitrox Class Part 1