http://grammar.ccc.commnet.edu/grammar/quiz_list.htm  This link has quizzes you can take on various subjects.  The above link covers simple and compound subjects.

http://records.viu.ca/~Johnstoi/grammar/fragments.htm  This link should bring you to a website with several exercises for identifying independent and dependent clauses.  Print them out, complete them, and hand them in.

http://grammar.ccc.commnet.edu/grammar/quizzes/nova/nova4.htm  This link has a quiz on punctuating compound sentences. 

http://grammar.ccc.commnet.edu/grammar/quizzes/nova/nova1.htm

http://records.viu.ca/~Johnstoi/grammar/punctuation1.htm  This link should bring to a website with several exercises for punctuating compound sentences.  Print them out, complete them, and hand them in.

http://grammar.ccc.commnet.edu/grammar/quizzes/nova/nova1.htm This link should bring to a website with a quiz for punctuating compound sentences with coordinating conjunctions.