Hello Anshika,

Since you have not mentioned your category in which you got 142 marks in the B.Sc Maths (hons.) entrance test for allahabad university, here are the final round cutoffs declared by the university - 

General - 160 marks and above

SC - 126 marks and above

ST - All ST candidates

OBC - 155 marks and above

More - https://university.careers360.com/articles/allahabad-university-cut-off

Hope this helps.