How's your color perception? X-Rite has the Online Color Challenge: drag and drop the colors in each row to arrange them by hue order. The first and last color chips are fixed.
Once you're done, press Score Test, and it gives you your results. One thing; it is a lot of work to rearrange all those colors!! (and how easy it is may also be impacted by the monitor you are using.)
I took a fairly quick stab at it, and got 22, which is by no means perfect, but doesn't appear too bad (lowest score is better, and it's on a scale of 0 to 1500.) And, you know, I wasn't really trying!