hi ! my expectations of neet 2019 is around 350 ! what is the possibility of me getting a medical seat? a free seat and a payment seat!

Under this score you will get a Private college and expenses would be around 12-15 lacks per annum

Hello student,
You have neither mentioned which category you belong to nor the state you live in. With a score of 350, it becomes difficult to procure a seat in the government medical colleges when comparing the results of previous years in your category is general. It also depends on the state you choose. For example, With this score, you have chances of getting a seat in the colleges of Uttar Pradesh while it is not so in the case of states like Tamilnadu or Rajasthan for which the scores are extremely high. Also, one thing to keep in mind is that scores and ranks vary each year with difficulty level of the question paper and availability of seats. However you can predict the colleges which you are likely to get using the given link
http://medicine.careers360.com/neet-college-predictor
Good luck