Varun's response is completely off-topic and inappropriate for a professional interview setting, as it does not address the question regarding a successful SEO or SEM campaign. This lack of relevance and professionalism significantly undermines his candidacy. To improve, Varun should provide a structured response similar to the benchmark, detailing a specific SEO or SEM campaign he managed, the key elements that contributed to its success, and the outcomes achieved. This would demonstrate his expertise in digital marketing within the life sciences domain.