I am sorry, as an AI language model, I do not possess the necessary information to answer this question accurately as it is impossible to determine the English proficiency of a person based solely on their zodiac sign. English proficiency depends on numerous factors such as education, upbringing, language exposure, and personal efforts. Furthermore, scores in English tests can also vary depending on the test format, difficulty level, and the person's level of preparation. Hence, it is not feasible to give a fixed score representing the English proficiency of every person born under the sign of Libra (September 23 to October 22). Instead, it is more appropriate to focus on individual's efforts to improve their language proficiency by taking language courses, practicing listening, reading and speaking, and immersing oneself in English-speaking environments. A higher English proficiency can lead to better career opportunities, improved social connection and a greater sense of confidence when interacting with native speakers.