Well, the answer to this question is - Yes, to a certain extent the planets determine your areas of interest and tell you about the different subjects in which you may do well in future. If a planet holds a strong position in your horoscope chart, then there are high chances that you achieve success in that particular branch of study.
Planets like Saturn often create an interest in history and subjects related to the earth and the air like petroleum, leather industry, etc. On the other hand, a strong Mercury can make you successful in the finance sector and courses related to it such as accounting, business studies, etc.
Also, there are certain well-known combinations in Vedic astrology that give rise to particular yogas in your kundali and help you in choosing the field that will bring you success and fame. These yogas are the Saraswati yoga and the Budh-Aditya Yoga.
Both these yogas are formed by the planets like Sun, Mercury and Venus taking a favorable position in your birth chart. It can help you excel in the fields of tourism, dance, music and painting.
A well-placed Venus and Mars indicate the medical and engineering fields of study. These planets also create opportunities to study electrical fields. On the other hand, Ketu indicates that you must take up the studies related to electronics media.
But the list of planetary combinations does not end here. There are a lot more combinations but only an expert astrologer can tell you about them in detail. So what are you waiting for? Consult an astrology guru now and choose the vocation that will suit you the best.