You haven't mentioned your Category. Nevertheless, the General Qualifying cut offs for 2020 have been as follows:

General Category/EWS: 720-147

OBC: 146-113

SC: 146-113

ST: 146-113

General Category/EWS-PWD: 146-129

With a score of 90, it is difficult for a seat in any course that conducts admission based on NEET score. Because you haven[t qualified in NEET with a score of 90 marks. B Category seats are also called Management Quota Seats and they are filled through State Counselling and the remaining seats are filled through direct Admissions by contacting the College directly provided the Candidate has registered for the respective State Counselling and has not been able to secure a seat in the Counselling.  But if you have decided about studying Medicine, you have to reappear for NEET in 2021 and score real good. That will be the only option because with this score, you cannot even get Private Medical Colleges. So you may have to consider appearing for NEET 2021. If you want to reappear for NEET 2021, you can prepare with the help of our NEET Knockout package: https://learn.careers360.com/knockout-neet-may/