As you can expect, there are some tests and evaluations out there that are free, but it usually costs something to get the scores.
There are a lot of brain games sites, puzzles, suduko, ect. which offer some freebies, but they are some of the tools recommended for use in a brain fitness program, and a game assessment will only show me my level of expertise in the puzzle or suduko style I am being shown.
That being said, I recommend the assessments at these links. Again, these are the sites that I am aware of that can offer training to the brain in the correct way to impact cognitive functioning that can be measured.
While I may improve my score at a game, it is difficult to extrapolate from an improved score to better fluid intelligence, at least scientifically.
Sharp Brains is a treasure trove of information about the emerging field of brain fitness. The author is positioning himself as a leading consultant on the field, so I am sure he is motivated to stay up to date, and impartial. There is an assessment and quiz page for you to do on your own.
When I was beginning my personal growth journey, a wise person told me that when I was feeling resentful or afraid or sad, that I should remember the phrase "gratitude is the attitude" when I was ready to feel better. That phrase has helped me feel better tens of thousands of times.
Would you share what you are most grateful for? Your story could be just what another person is searching for to renew themselves? Thanks.