for XAT, how many questions in each sections would be considered safe for attempt to get a call from XLRI?

See, you need at least 35 marks in total. For getting that you need to attempt at least 50 questions out of 76 in XAT. Because in Decision-making and Verbal, accuracy can be poor. In short, try to attempt at least 16-17 in Verbal, 18-19 in DM & 14-15 in QADI