I have scored 558 in neet, can I get chance in govt. medical college in kolkata

Dear Souradeep, you haven't mentioned your category. Nevertheless I am mentioning you the cut offs for all the categories under STATE QUOTA.

• GEN - 479
  
• OBC-A - 479
  
• OBC-B - 474
  
• SC - 349
  
• ST - 183
  

So, as per last year cut offs you have a fair chance of getting govt medical college under STATE QUOTA.
If you belong to GEN category than you can't get Medical College, Kolkota. Except this you can get others colleges in Kolkata.
Having said that cut offs change every year as it depends on various factors like number of students appeared in the exam, number of seats present etc. This year the cut offs are expected to increase.
You can check the given below link to predict your college -
https://medicine.careers360.com/neet-college-predictor
All the best
Feel free to ask for any query

Dear aspirant, congratulations for scoring such a good score. Yes you will surely get a medical seat in any government college in Kolkata. As per last year's records a candidate scoring above 500 were given seats in government college , thus we can expect the same this year.
All the best for your future ,
Thank you.