Hi,
If you have cleared any entrance exam and getting a good college then for sure join the college and start your degree but if not then take a drop prepare yourself for next year,  either enroll yourself in coaching institute or do self study it depends on you and give entrance exams of different colleges to get a good ranked college . Because competition is tough in every field if you feel you are not fully prepared then try next year but try only for top colleges as there the learning environment is better and you have better chances of getting a good placement.
Hope it helps...