scores will be depend on the several factors like no. of aspirants appeared,level of difficulty of questions in the examination,availability of seats in medical colleges, marking scheme, reservation provided.

but year by year the cut off will be falling down as from the past records,

like in 2017 the cutoff for general category is 131 and for obc it is 107 

so hopefully the minimum marks for neet examination this year will be in between 95-100(note this scores are just to qualify the exam) for obc but in this scores you can get only private medical colleges in any state, not mandatory in karnataka. if you want admission only karnataka and also in any precious college then your score must be in between 300-400.