Kind of piggy backing off the last thread on diving, we'll be at CSA in 7 days and I have a few questions on diving. We both have no experience diving, so I need all you experienced CSA divers help please!

How difficult really is the swimming exam and how many laps do they have you do? (I read it's 8 perfect laps in the pool and difficult to pass & I've also read 4 easy laps) I'd hate to show up and fail that part if it is harder than I thought.

Is it worth spending 1/2 the day to do 1 shallow dive, and what kind of animals can I expect to see on a shallow dive?
I'd love to see dolphins/fish/turtles but the mention of nurse sharks freaks me out a little, even though I know they won't hurt you?

Thank so much for your help!