I suppose your question is how many Marks does one need in NEET in order to get Gandhi Medical College for the OBC category.
They also have their own exam. 

It will be nice if you could specify the Gandhi Medical College you were taking about.
For Open Category the cut-off rank last year (2017) was within 1700 which corresponds to a score of approximately 560. This cut off also depends on whether you are applying as domicile or through all India Quota. However, to be absolutely sure, try scoring around 560 to ensure a seat in this College. I hope you find this helpful.

https://www.google.com/amp/s/www.careers360.com/colleges/gandhi-medical-college-and-hospital-secunderabad/amp

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