Hello aspirate 

Since the minimum marks required for obc candidate to get admission in AU in the last round that is 4th round was 150+ marks for bsc math entrance and since you don't have such high score you cannot get seat there. 

For reference visit the link below 

 https://www.google.com/amp/s/university.careers360.com/articles/allahabad-university-cut-off/amp

Good luck