On-line Interactive Drills...?

Hello, I'm a freshmen in college and I'm taking a challenging but very interesting and albeit very rewarding class on precision language.

My question for you is: do you know of any in-line interactive grammar drills that drill over the jobs in sentences. Things such as direct objects, indirect objectives, predicate nominatives and the such. I would like to really ingrain these understandings and workings into my mind so that I can do well on my weekly tests. I really like to practice and practice these concepts so that I can really understand them, since they are a challenge for me.

Wow, any assitance would be most appreciated.

Thank You.