Hello dear student, 
Cut off depends on number of factors like level of toughness of the paper , number of students that appeared in the examination.
So if this year's neet paper was easy,  chances are that cut off may get a hike for medical colleges including p.d.u College.
thankyou
Feel free to ask your further queries if any

There's no necessary condition that it will increase or decrease. The cut off for a college depends on the number of people qualifying and choosing the college. It varies every year. Previous year cut off are just an idea that at around such an score, it is possible. 

I hope it helped!

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