The cutoff marks for the medical seats will change every year depending upon the number of students, the level of the exam and many other factors. Noe the thing is that increase in the medical seats does not clearly means that the cutoff will go down for the medical institutes. As the number of seats will increase along with that the number of students also increase so the cutoff marks will differ by 30-40% with the previous year. And if you really want some good college then it clearly means that yu have the score better than the cutoff marks of the previous years. Also refering the previous years cutoff for the medical entance tests you can have the idea of the possibility of your admission in the college or institute. Refer the link below to know more about the cutoff marks for the AIIMS.

https://medicine.careers360.com/articles/aiims-mbbs-cut-off