However,JEE Mains cutoff marks and category wise All India rank are announced by National Testing Agency and are based on various factors like numbers of students appeared,seats available,difficulty of exam and many more.And for this year the cutoff marks for ST category is set to 44 to appear in JEE Advance and minimum percentage required in 12th for ST is 75.3 also the cutoff varies in Universities vastly.

Dear candidate

For getting into IITs you need to write JEE Advanced for which you will have to qualify JEE Mains as you asked yes, as you belong to ST category there is chance for you for getting into NITs or CFITs but it depends on lot of factors so, visit the below mentioned link to predict how many and what colleges you can get into

Hope this Information is helpful