Swimming Help!

Hey everyone, I recently got an Annex X contract and my goal is to become a Coast Guard rescue swimmer/AST. I’m really excited about the opportunity, but honestly I’m pretty nervous about the swim portion because swimming is probably my weakest area right now. I have access to a pool twice a week, Wednesdays and Saturdays, and I’m looking for advice on what workouts I should be doing to improve my swimming, especially my freestyle form, breathing, endurance, and speed.

For those who have gone through Annex X or AST
training, what workouts or drills helped you the most, and what should I focus on to become a more efficient swimmer and be prepared for the swim portion? I’m willing to put in the work, I just want to make sure I’m training the right way. Thank you!