On the game learn to fly what does reach 6000 feets mean

You have got to travel 6000 feet and then you will crash into a wall of ice and complete the game
p.s make your resistance 3% and keep your speed between 175-200
buy all the ramp height,acceleration,air resistance,and the roket fuel if you start to slow down go down,before you hit the water speed back up and you will go faster