@westwood..Thanks very much for your reply
But Do I have the right for apeal because I have received my refusal on 31 January but I applied new application on 6th feb.i got there answer on 1st march.

hi , i have been living in uk from 2006 as student. study history is outlined as below: from 2006 to 2009 have studied B.Eng(hons) in mechanical engineering.completed degree, from 2009 to 2011 i had post study work(psw) than i started master course for further two years till 2013 than applied again ...