Hmm I still see my lesson progress and I also see my "score." I'm having trouble recalling lessons based on rating but it's been a while since I've looked at the old chess mentor interface. You can always contact support directly. 
Chess Mentor on the new site
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I really enjoy the new version of the site, but one thing is making me stay with the old one. I mean Chess Mentor. What I really miss is section with history of my last lessons and what makes me even more sad is lack of information about ranking for particular lesson. I have always done lessons basing on their ranking and now such strategy is not possible. Do I miss something or is it really impossible to see? And if so, is there a possibility to send a request to chess.com staff about this issue?
Regards