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Capricorn, Scorpio, and Virgo are signs capable of tremendous focus and find it more natural to shut off surroundings when dealing with a situation, people, and working through issues. Capricorn is a sign that does not stop, continues to trudge forward, no matter how hard things get. Virgo is methodical, patient, and careful. Scorpio is inquisitive, relentless, and self-disciplined. Sagittarius is towards the top of the list because it is a sign associated with deep thinking, philosophy, and driven ambition— and fire signs in general are very talented at focusing their energy on their goals, passions, and desires which is why you will see them follow accordingly on the list.
Air signs in general are inherent thinkers, but it doesn’t mean they are focused. Air signs are far more internally restless, elementally speaking because they are more apt to view things from many different perspectives. They are less likely to want to sit in one place and learn one thing— they are interested in many things and need frequent breaks or a change of scenery to do so. Aquarius Moon is capable of focus, more so than Libra and Gemini, respectively, because it is a fixed sign. However, it is also detached, observant, and needing of personal movement and freedom type of Moon.
Keep in mind, this is Moon signs alone and the rest of a birth chart affects such qualities.