I've been casting about for grammar exercises I can send home with my student this year and I think I've found a free, online workbook with online exercises that will work well. Here is the link for it:
http://grammar-teacher.com/free-grammar-book/
Let me know what you think of it! I find it simpler to use than K.I.S.S. grammar....
Regena
Oh! I just found these additional online grammar quizzes to try, too:
http://www.eduplace.com/kids/hme/k_5/grammar/