I have 100% completed over 30 courses on Chess Mentor, so yes it certainly is possible. Haven't run into your problem; what courses are they?
Stuck at < 100% ???
Ah, yes, I have 100% on all my completed courses except two champion tactics with GM Wolff - interference and back rank (both on approx. 95%). I was thinking that perhaps you have to have a minimum score of say 30% or so on all lessons in a course to get 100% but I'm not sure.
Not the biggest problem in the world but still a little annoying since I usually sort the courses by completion.
Yes, there is at least one with a calculation error. I did Champion Tactics with GM Wolff Interference some time ago, and even though I 100% completed the course, my record says 95.65% complete. This is (most assuredly) a programming error, since there are only 22 questions, but there is no number 14 and there is a number 23, so if you finish them all, the computer calculates 22/23 done = 95.65 %. Easily fixed. Same problem with GM Wolff BACKRANK, as there is no #28 or #33, leaving only 35 questions, but the calculation is 35/37 = 94.59%.
I'm betting that somebody deleted a couple of questions, and forgot to update the numbering.
Does anyone know what it takes to "finish" a course in chess mentor? There are two courses in which I have completed all lessons but their completion rate is not 100% and I can't figure out why...