Which of the following is NOT a focus for divers before a dive?

The correct choice highlights an aspect of dive preparation that is not typically a focus before a dive. While practicing diving skills is an essential part of a diver's training and development, it usually takes place in controlled environments like training sessions or pools prior to actual dives. Once a diver is preparing for a planned dive, the focus shifts to ensuring that all equipment is ready, that air supplies are sufficient, and that buddy checks are completed. These actions are critical to ensuring safety and readiness for the dive.

In a diving context, the preparation phase is more about verifying that everything is in place rather than practicing skills. Thus, while the practice is vital to becoming a competent diver, it is not a primary concern right before embarking on a dive.