Hi Tawfeeq, there is no fixed percentile or cutoff percentage for scores in cmat. It all depends on the number of test takers, difficulty of exams and number of students who have scored less than your score. However going by the past records, 250 can yield 97+ percentile or even 99+ percentile. The top 3 colleges for this score can be, 

1) KJ Somaiya, Mumbai 

2) We School, Mumbai 

3) Great Lakesh, Chennai  

There are other colleges but they may come under the second top tier. Among the top colleges these can be a good pick for your score. All the best !!