Good afternoon. How old id your grandson?
pardon me, "is"
Are you coming back?
Sitting filling out worksheets although it can form part of his learning can be a bit boring. You need to vary the learning, involve cookery in your science for example, shopping in your mathematics, project planning in your english, days out in history and geography. Use the computer, books, dvds, outings and library visits to make it varied and interesting. Encourage him to do a variety of different activities to tie in with the curriculum. Swimming, bowling, running for P.E. Encourage him to make presentation posters, booklets, even speeches.
Keep his attention by trying to use topics which he is interested in and use them in the curriculum.
May I recommend a good book for some advice too available from Amazon: Unqualified Education - a practical guide to learning at home age 11-18 by Gareth Lewis, Bethan XXXXX, XXXXXual Lewis, and Wendy Lewis.
Teach your own - The john Holt book of home schooling by John Holt and Pat Farenga.
Thank you, you have given options that I hadn't thought of. I will take your advise to heart and work on a solution. He is not in school for disciplinary reasons, as you figured out. Again, thank you! Linda