@syal ji: Yes you can do that or you can have someone help you. You can go to ratemyprofessor.com and see teachers rating before registering the classes.

Option 2 is to talk to your professor about your problem, some professors are very nice and he would able to help you out if you have any problems. The best way would be is to go to tutoring center for chemistry where they would be able to help you out mostly.

Finally if you have applied all these and didnt helped you at all. Well online classes as you said is a good bet.