The planets in your horoscope, or birth chart, indicate the type of education and profession that could suit you best. It can also highlight and reveal the periods best suitable for your education.
As you already know, the twelve houses of the zodiac represent various sides of your individuality. It also creates the conditions for your life — in terms of money, health, career etc.,
According to astrology, the third house is the home of education. It represents your capacity for learning, and intellectual capabilities. Ruled by the Sun sign Gemini, and the planet Mercury, the third house provides the ground for what type of schooling and subjects, including college learning, could suit you best.