Something needs to be done to make the school year more worthwhile for such studentsActually, it needs to be done for ALL students. You really think the only kids poorly served by school are those that teach themselves math on the side?
Nearly every kid has an innate curiosity about the world and more importantly the people around him. Some prefer symbolic worlds, others the physical, and most the social.
Schools are currently poor places to learn about any of those. The bizarre hierarchies in place seriously warp most children - witness the daily cruelty that is normal in an average school (others on the internet have made this point better than I can).
To most people, Lockhart's lament is a very minor annoyance compared to the social retardation that goes on in these institutions. Rampant alcohol abuse and unreasonable sexual promiscuity in universities are the inevitable backlash to years of social repression, far beyond the young ages at which it might be called for.
It was not unreasonable in earlier times to consider someone a "young man" or "young woman" at 13 or 14, and as a fully functional society member at 16. Why does this seem so completely ludicrous now? Has our genetic lifecycle programming changed? Of course not - but our social lifecycle programming has.
All this to say that the kids for whom symbolic systems education is too slow are the lucky ones. For them, there is at least the library as an outlet for that spark. Consider the rest, who have no such thing.