Not sure what you mean, here. I think you're referring to the Puzzles section, and specifically the Rated Training Puzzles.
If so, each member's success (or failure) can be viewed for the last 30, 60, 90 days. (even 1 year)
If you click on the Full Stats (light grey type, word-icon) you can see each member's current rating, the total number of puzzles they have attempted, the number they succeeded on, the number they failed on, how their rating has climbed in the last 25 puzzles they have tried, the ratings of those individual puzzles they attempted, even the board of each puzzle can be glimpsed.
And for all of this detail, an overall Percentile is given. [Chess dot com only has so much memory afforded to their site, so this is very comprehensive detail for each member, to show their standings.]
I'm really enjoying my progress, btw. If I get all 45 of my next Rated Training Puzzles correct, I will climb to a 74 Percentile Correct standing, and if I go on to get another 61 Correct, without one single Fail, my percentile goal will be reached: 75% Correct. Assuming 4 points for each puzzle, 106 needed, my score may improve to 2737. That would be really something, imho. Hoping to get there at a rate of one puzzle every two days, and that would mean sometime in September. Once at the 75% level, then all I have to do is get 3 out of 4 Correct from then on. Fairly certain I can accomplish that.
I had correspondence with the Admin on this site, recently, about the Puzzles and the following was stated, verbatim:
"The thing is, I learned in talking to the team that we are actually pretty soon going to overhaul/remake the stats entirely."
So, we'll see what comes of their efforts.
The Puzzles feature (formerly known as Tactics) is a good metric of a player's ability and a score is assigned based on performance just like the player has a score for Daily/Rapid etc.
But with Puzzles there is no indicator of where in the percentile range a player lies so we don't really know how good any given Puzzles score really is in terms of relative strength.
It would be good if percentiles were also published for Puzzles ranking as well as other rankings such as Daily/Rapid etc.