Hii!
Although you haven't mentioned or tagged the name of the examination you are talking about, let me assume that it is for the NEET UG 2020 entrance exam. Let me tell you that as per the previous year datas,  320 marks are quite low although you belong to OBC category. There's not much difference between the cutoffs of General and OBC category candidates. You can refer the following article for more information-

https://www.google.com/amp/s/medicine.careers360.com/articles/neet-cutoff-mp/amp

Hope this helps.
Good luck!