Dear adavani

Congratulations that you are expecting suc a good score in NEET 2018. WIth a score of 550 you definitely stand a chance to pocket some government seats, given that MBBS seats have seen a slight increase this year and cutoff is also expected to go a little lower. 

You can get details of last marks which got admission in every state last year under both AIQ and STATE QUOTA from the link given below. It also contains expected cutoff by experts .

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-know-expected-cut-off-and-section-wise-analysis%3famp

Hope it helps. 

Wish you all the best.