Considering your category and comparing with previous year trends, aim for a score of more than 450.
All the best.

Well you can't really know what score is enough to get a seat because of the changing level of difficulty  of exam everyday. 

The syllabus remains pretty much the same every year but the level is different. 

The performance of all the students determines the cutoff. 

So the best is to simply work hard and score as much as possible. 

B

For getting a mbbs seat in gmc amritsar under obc category through all india quita counselling, try to have score of 530+ marks in neet ug exam..
Practise  and revise regularly.. you will surely score well..
Good luck.. prepare well...