45.75 is a very good score. A total of 31/74 is expected to get a percentile of 90+. with your score, you can definitely get above 96. please make sure your marks do not include GK marks and also deduct score according to the no of questions left by you in excess of 8 (0.1 per question)

The rank varies every year so the exact prediction would be tough to, With this score you can expect 75 -80 percentile. The colleges you can have the chances for Birla Institute of Management Technology, Greater Noida, Institute of Management and Information Science, Bhubaneswar, Master School of Management, Meerut etc.

You can also use XAT Pathfinder tool to know your best chances.

https://bschool.careers360.com/pathfinder/xat

Good Luck!