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Deep dives aren't necessary. In fact, I'd suggest practicing shallow. Valve drills and s-drills in 10', without visual reference. That's a good measure. Personally, I wouldn't work on specific drills, unless you have a competent mentor. Why learn things incorrectly? You're already working on the hardest parts: trim and buoyancy. Have buddies give you feedback. Tell them to be honest. Feedback while you're diving is really useful, especially for trim. For buoyancy, good practice is timed ascents/descents. We would do 30 second slides for 10', then hold there for 30 seconds, then slide again. Do that from the surface, down to about 40 (stopping at 10', 20', 30', then 40'), then come back up (30', 20', 10', surface). If you do have someone to show you correct procedures, practicing valve drills and s-drills would be good, especially mid-water (again, no reference). Fin kicks would also be something to work on (flutter, the tech one, not the rec one, modified flutter, frog, modified frog, helicopter, back).
Good luck!
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