Mercury rules 12th and 3rd house is in 9th house in Pisces

Mercury is the planet of intelligence, communication, and rational thinking. When it is placed in the 9th house in Pisces sign, it indicates a person who has a strong desire for knowledge, spirituality, and wisdom. They have a philosophical outlook towards life and are inclined towards higher learning and education. They have a creative and imaginative mind and often use this talent for writing, teaching, or art.

However, there can be some challenges with this placement. Pisces is a dual sign, and Mercury can get lost in the fog of Pisces. Therefore, the person may struggle to find clarity in their thoughts and ideas. They may also face challenges in learning and retaining information, especially in a structured or formal setting. They need to work on developing their concentration and focus.

Overall, this placement is favorable for spiritual growth and higher learning, but it requires the person to maintain discipline and focus in their pursuits.