With a 536210 rank and SC category, getting Computer Science Engineering (CSE) in Shivpur (Indian Institute of Technology, BHU) is not possible, as IITs take admissions through JEE Advanced, and the closing ranks for SC category in CSE are usually under 1,000. Your rank seems to be from JEE Main, and it's too high for top colleges like IIT BHU. You can try for state government colleges or private colleges where the cutoff is more flexible for SC candidates.