Hey archana,
Xavier's college offer many UG PG courses even diploma and phd too. The admission process for undergraduate courses start from may and ends in june same for post graduate course ,so you were about admission through management quota so man you have compulsory cleared your 10+2 from recognized board ,there are many reserved seats for sc st students and for physically challenged ones too.
Students who have not scored 60% but still fulfilling other criteria and also belong to category II and III and also economically backward category students can have a talk to principal ,dean may allow you for admission.