You are expected to explain/analyze (AO2) the goals of supply-side policies (SL+HL)
Supply-side policies are government actions done to increase the aggregate supply of the economy, by improving the quality and quantity of factors of production.
Achieve long-term growth by increasing productive capacity
Improve competition and efficiency
Reduce labor costs and unemployment through labor market flexibility
Reduce inflation to improve international competitiveness
Increase firms' incentives to invest in innovation by reducing costs
These are all meant to shift the economy's LRAS/PPC to the right.