According to a quote from the film, what is necessary alongside the best test score?

In the context of the film "GATTACA," a blood test is essential alongside the best test score because it serves as a key factor in determining an individual's genetic predisposition and suitability for specific roles or opportunities. Within the society depicted in the film, where genetic identity and predispositions heavily influence social standing, a blood test reveals vital information about a person's DNA, such as potential health issues and overall genetic quality. This additional layer of evaluation goes beyond academic achievements, highlighting the film's central theme of genetic discrimination and its impact on personal aspirations and identity. Therefore, having a blood test is crucial in assessing one's worth in a society that prioritizes genetic makeup alongside accomplishments.