How do u get past level 2?

here i got it for u

Perils of the Coral Reef

Being your first real level, you may find yourself overwhelmed with the
steep difficulty level. Get used to it. From the beginning speak to the
guardian crystal (using sonar) and then speak to the dolphins in this
circular area. They will ask you to race them but you must first catch a
red fish. Catch one red fish from the surrounding area and swim in
between the columns as they instructed. Beat them in the race (Press B)
and you will win yourself a vitalit. Head out into the next area.

From here you can go 2 directions. Down the right path is a dolphin with
nonessential information. He tells you about the cave in this area that
is blocked off by strong currents. When you check it out you will find
he is absolutely right! Like I said this path is not important for now.

The left path takes you to an area with another dolphin (did I mention
the sharks in this area. Don't bother with killing them!). Speak with
him and he will tell you about his brother who is missing. You can learn
the Song of Shark if you find him so let's be on our way. Go to the
surface of the water and do a tail walk (press A rapidly while on the
surface). Look around until you spot a low wall that you can jump
across.

(checkpoint) This area is littered with sharks. Also in this area is the
young dolphin we were trying to find. Speak to him and he will ask you
to help him rescue his pet turtle from the sharks. You must kill every
shark (B button) refilling lost health when needed. After doing so the
young dolphin will teach you the Song of Turtle. Go back and speak to
his older brother who will teach you the Song of Shark.

- Song of Turtle (Turtles will now follow you.)
- Song of Shark (Sharks will be now be confused.)

To use songs aim at the nearest creature and use your sonar. Easy huh?

Now continue past where you saved the turtle and head passage (dodging
the jellyfish) until you reach an open area with 2 sharks and a dark
tunnel. Forget both of these and head through the left passage in this
room that takes you a large area with a hint crystal and 2 dolphins.
Read the hint and speak to the dolphins. This area has many passages.
The two caves in this area lead to nothing important so head back to the
area with two sharks and the cave. Dash through the cave (make sure you
are at full health) and hopefully the fish won't kill you. This will
take you to the Great White shark.

(checkpoint) Don't worry this thing won't hurt you until you provoke it
with the Song of Shark. First though you must know what to do....

- Use the Song of Shark.
- Provoke the shark into chasing you through the corals.
- Once he gets himself stuck you will obtain the Power of Vigor.

This will probably take you a while so be patient. With the power of
Vigor you can exit the level.

Go back to the area with the 2 dolphins and crystal. Swim over the low
wall in this area (it will be to your right from the entry point) and
swim past the sharks. Collect the power of Vigor and swim into the exit.

here is a new one
Exit the main enclosement where the two dolphins are racing if you turn left you
will meet a dolphin that tells you he has lost his brother. You should see a gap
in a wall that you can jump over into a new area with turtles. Kill the Sharks
that are attacking the turtle and the dolphin will teach you the 'song of the
turtle'.
Jump back over the wall and talk to the other dolphin again, he will teach you
the 'song of the shark'. Go back over and carry on past the turtles. Down this
way and you should see a dolphin chasing a red fish around. Catch the fish and
you will be awarded with the 'song of the fish'
Then look around various parts of the area you should find two tunnels either
one accesses the great white area. Use illuminating fish (bright yellow with
black bits) to access the dark tunnel or Use poisonous fish (red + yellow
colour) to access the tunnel with pirhanas (use the sonar).
Once you access the Great White area you will have already noticed the cut scene
at the beginning of the level. Try and get the shark to follow you through one
of the gaps in the middle rock. Once he is caught head butt him in the face to
receive the power of vigour. Use the power of vigour gem in the middle of the
area and then start attacking it until it dies.
Afterwards backtrack to the area where you the dolphin is chasing the fish in
the centre is a route half blocked by rocks. At the end you should be able to
find a power of vigour, collect it and swim as hard as possible into the bright
light.

Ok I must be a real idiot but how the heck do you 'quick turn'? I'm still with the teacher.