Transfer of energy - A large topic that has not come up recently. This includes conduction, convection, radiation, absorbers, emitters, kinetic theory, etc.
Renewable energy - Very trendy in the news, the exam boards like to reflect on these trends.
Big Bang - Red shift and cosmetic microwave background radiation. This leads on to waves, the EM spectrum, sounds, etc.
20% of the P1 paper is maths, simple three part equations. Know your significant figures and standard form.
Sankey diagrams will be a larger question because previous smaller questions tend to come back as higher mark questions.
You need to know about how nuclear power stations work, how fossil fuel power stations work, the effect on the environment and how we can reduce it; carbon capture and renewable energies.
And actually passed?