For this 'to what extent' question, establish a clear position in your introduction – whether you strongly agree, largely agree, or agree with significant reservations – and consistently reinforce it throughout your essay. While acknowledging the necessity of treating existing diseases, frame this within your main argument by explaining *why* prevention should take precedence or *how* it complements treatment, rather than simply presenting two equal sides.

To strengthen your argument, consider specific examples. You could reference Finland's successful 'North Karelia Project' in reducing cardiovascular disease through lifestyle changes, or Singapore's proactive national health screening programs and promotion of active living. These illustrate the long-term cost-effectiveness and improved public health outcomes of a preventive approach.

The most common pitfall is failing to take a decisive stance, instead offering a balanced discussion of both prevention and treatment without a clear conclusion or prioritization. To avoid this, ensure that even when discussing the merits of treating diseases, you consistently link back to and re-emphasize your main argument regarding the *extent* to which governments should prioritize prevention.

For an opinion essay like this, employ transition phrases that guide the reader through your argument and counter-arguments. Use phrases like 'While it is undeniable that...' to concede a point, immediately followed by 'Nevertheless, a more compelling argument can be made for...' to pivot back to your main stance. Similarly, use 'Consequently, it becomes evident that...' to introduce a conclusion derived from your points.

Examiners awarding band 8-9 for this question look for a nuanced discussion that goes beyond superficial pros and cons. They seek a sophisticated understanding of the economic implications (e.g., long-term savings vs. immediate costs), ethical considerations, and the societal impact of both approaches, supported by precise vocabulary related to public health policy, resource allocation, and quality of life. A well-developed, consistent argument that demonstrates critical thinking and a clear, well-supported position is crucial.