friscuba once bubbled...
You might want to have a talk with you instructor and attempt to get an honest assessment of your buoyancy skills and air consumption rate. Those are two important points going into the AOW class. Some students are ready after their training dives, others would be best off geting more practice. If you are bumping into everything, can't do controlled ascents and hands free safety stops and suck an aluminum 80 dry in 25 minutes, it might be best if you get some practice first, you'll get more out of the class. If you're doing 50-60 feet dives for 45-50 minutes or longer, in control of your buoyancy and the OW class was a breeze... you might be ready to go for it now.
Whatever you do, getting more dives in on the front end is going to help you out for the future.
Have a blast!
Steve