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Is this meant as work time for him rather than choice time? - for DS's class choice time was the fun educational stuff - when they got to use laptops or iPads. Were you specifically asked for school type worksheets or workbooks? DS's K gifted class had all sorts of other things for choice time - their leveled book boxes - they always had books at DS's level despite it being 4 or 5 levels ahead of others. They could always read during choice time. For math activities they had soduku and other math game type things. But they also had puzzles, math rods, and all sorts of games. They could color or do crafts. Choice time was for the fun things. Or is this to have a box of things to replace the work they are doing when they are working - like giving him different work sheets? With DS I found that K was backfill, things he might have missed when he leaped ahead. But they moved so quickly thru them and switched activities so he wasn't THAT bored. For him K wasn't learned material - he actually said at the time he learned at home - 1st grade was better, not much but better.
DeHe