When tackling this opinion essay, clearly state your agreement or disagreement in the introduction, for instance, 'I strongly agree that governments should prioritise preventive healthcare.' While acknowledging the necessity of treatment for existing conditions, ensure your main argument consistently champions prevention as the more sustainable and cost-effective long-term solution throughout your body paragraphs.

Consider using real-world examples like Finland's success with the North Karelia Project, which significantly reduced cardiovascular disease through public health campaigns and dietary changes. You could also reference the long-term economic benefits, such as reduced healthcare expenditure, or the improved national productivity from a healthier workforce.

A common pitfall is discussing the merits of both prevention and treatment equally without taking a clear, dominant stance on which should be prioritised. To avoid this, dedicate the majority of your essay to arguing for your chosen side, perhaps by framing the 'other' side as a necessary but ultimately less impactful or sustainable approach in the context of the question's 'rather than' premise.

For this opinion essay, employ a 'concession and rebuttal' strategy in your body paragraphs to demonstrate a nuanced understanding. Start a paragraph by acknowledging a point for the opposing view using phrases like 'While it is undeniable that...' or 'Admittedly, treatment is crucial...', then swiftly transition to your counter-argument with 'However, a more proactive approach...' or 'Nevertheless, the long-term benefits of prevention outweigh...'

Examiners look for a sophisticated understanding of the socio-economic implications of both approaches, not just a simple 'prevention is better' argument. A band 8-9 response will demonstrate a nuanced perspective, perhaps discussing the ethical considerations or the practical challenges of implementing widespread preventive measures, while still maintaining a clear overall stance and well-developed arguments.