You need a GCSE( general certificate of secondary education) to become a firefighter. 

In this occupation one should be good in subjects such as Physical Education, Biology and Chemistry.

A firefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires 
that threaten life, properties, or the environment.

The fire service, is one of the three main emergency services. Firefighters have become ubiquitous around the world, from wildlands to urban areas, and aboard ships.