Mathilde Marchesi's Opus 31 Exercises are a masterwork--a thorough kick in the pants for any singer. However, they are NOT progressive in the sense that they flow from easiest to most difficult. They are terrific exercises that will ground you in the techniques of bel canto. However, if you simply go straight through in order, they get treacherous quickly!
To help singers "decode" these exercises, I've created the above PDF. Start with those labelled "Basic," and once you've mastered them, proceed on to "Intermediate," and finally to "Advanced."
I hope this helps!