My wish list....buoyancy and trim, navigation, and better equalization.
Buoyancy and trim, I think, are a given to work on....working out my weighting has helped (I was definitely way overweighted in my class; it took some encouraging from other fellow divers to feel comfortable ditching a lot of that weight). I try to practice this when I'm in the water, but it's hard without feedback to know what I need to work on/what's improving.
Navigation is scary and hopeless. I still feel like I rely on more experienced buddies when doing anything more than a straightforward anchor dive, and I'd like that to change.
Finally, equalization....I can equalize okay but it takes me longer than others, and requires more conscious thought and effort than I would like (I do practice on land, but it's not the same as practicing underwater while descending). Valsalva doesn't work great for me, so I've been experimenting with other techniques, with varying success.
There's a lot more of course (I'd like to practice more drills, esp for equipment malfunctions like manual BC inflation/free-flowing regulator, etc), but those are the three core topics that I really feel I could have used a ton more work on. On the flip side, I'm pretty happy with my air consumption (being a petite woman is great sometimes!), and - thanks to accidentally learning with a leaky mask - I am a master at mask clearing!