I do agree that catechesis needs to be individualized, but on the other hand---we had 26 people in our Catechesis class this fall, and 26 solo classes with me a week are just too much to be scheduled.
So, what did I do? On Wednesdays our parish also has Family Night (we have a common fasting meal, followed by adult instruction and kid's instruction, in seperate groups), and so I started to announce that my office door would be open to any of the Catechism Class attendees starting at an hour before the kitchen starts serving....so anyone who wants or needs to discuss anything with me has a 'standing invitation' to do so.
And I do not get all 26 to come every week, but in the course of a month we get most of the class to have some one-on-one time with me, and that seems to help things. It also helps the 'regular' parishioners, too, since they know they can find me for confessions an hour before 'Coffee with Fr Chris' starts.