I think my score was around a 96 and I had about 35 hubs. (Began the AP March 2012)
Being in the Apprenticeship Program has not really affected my hubber score. My score usually hovers around 94 and can fluctuate anywhere between 88 - 97. The hubber score is an internal measure for HubPages and is a true mystery for many. Just an opinion, don't focus too much on the score; I've had fellow friends with a 100 hubber score and their traffic is sometimes lower than those in the low 90's. Again, it is a HubPages algorhythm mystery.
However, if you are curious about external traffic and income these two areas have shown a steady and significant increase for me. I'm sure the knowledge I gained in the AP helped with that. Plus, hub maturity (and quality) does seem to matter. Regardless, Google does have updates and traffic can fluctuate. In the end, don't worry about the score.
Best wishes to you if you choose to apply for the Apprenticeship.