First of all, 3/4 PE is very different to units 1/2.
In 3/4, you will be studying these main areas:
Assessing physical activity & sedentary behaviour
Physical activity and the social-ecological model
Promoting physical activity
Acute responses to exercise
Foods, fuels and energy systems
Fatigue mechanisms and recovery strategies
Fitness components used in sports
Data collection & activity analysis
Assessment of fitness
Fitness training methods & principles
Chronic training adaptations
Performance enhancement – physiological, psychological dietary & other considerations
Legal & Illegal performance enhancement
Anti-doping codes & practices
It's actually not a subject where you can just rote learn things, you actually need to understand what/how/why things happen.
The 6 week training program is time consuming, although, not every school does this, and that is where you have an advantage over them in the exam

Personally, I've found the subject one that you can learn things and apply it easily to a sport that you play in your life.