GMCH CHandigarh is one of the best medical colleges in India. The competition being too high it is becoming tougher to get into it.GMCH mostly releases it's cuttoff marks by mid August.Although it is not possible to tell the exact cuttoff,but on seeing the previous years marks and cuttoff ou will have to score atleast more than 640 to get into the college by All india quota. For state quota students the score has to be about 580 or more. 
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If you need any more details about the college refer to the link below:

https://medicine.careers360.com/articles/neet-cutoff-chandigarh