If you are on the roof of a high floor in a building, and fire catches you, what is the best method to get away from that situation?

To get a nearest fire Extinguisher or Hose and and open it on you at after that use the stairway and get away 

First of all, don't panic. If it's safe to go down using a fire exit via stairs then do so. Do not use the elevator. Be quick and in control. But in the event that no egress path is safe to pass, position yourself within visual by the emergency responders and catch their attention.

Don`t Panic, break the nearest MCP ( manual call point ) to get help from the emergency responce team. and if you can manage find the safest and nearest emegency exit route to escape to get help ASAP.

Stay in the area where you are visible from any aerial view   

I can get down by use stairs.

First i will be calm and use the nearest fire exit  which will lead me to a safer area.

AS A SAFETY OFFICER MY RESPOSIBILITY IS NOT GET FIRE ON ANY FLOOR. PREVENTION AND IMPLEMENTATION OF SAFETY MEASURES THROUGH MY SKILLS WILL ELIMINATE THE HAZARDS AND RISKS OF  SORROUNDINGS ..

First, you should know the safe location of your building if situation rise (a building map). use the nearest fire exit for safe area, grab atleast a fire figthing equipment such as fire extinguisher for additional protection.

First, I will asses the surroundings to determine if there are safety tools such as a Blanket and Fire Extinguisher to aid in my descent from the roof through the emergency exit. Then I will use the emergency alarm to notify the building security of the situation. In case the emergency exit is blocked, I will contact the Local Civil Defence to get their attention that I am unable to leave the building roof and wait for their aerial support to arrive at the location of the site. If I happen to have received any injuries from the fire and my clothes are stuck to the skin, I will not attempt to remove them. And most importantly, I will stay calm and leave no room to panic

Stay low to avoid smoke, fumes, and super heated gases that may have entered. Close doors as you leave to confine fire as much as possible. If the alarm is not already sounding, pull the fire alarm on your way out of the building. If there is no alarm to activate, yell “fire” as you leave.

Dont get panic.never use elevator.dont do any heroic thing.use fire exit to come down bt if there is no safe egress path ,stay visible so that emergency reponder can get your attention