• yes,as comparison with  last year in jadhavpur University ,mechanical stream closing rank for OBC-A was 4406.it means according to that you can get admission in mechanical stream in same university.but we are not 100% sure for that you will get admission it will totally depend on cut off.but there is more chances to easily you can get mechanical stream in that university 

Yup.. u can definitely get that

yaa mostly you will  get if there is no competition for cse you will not but for mechanical you have scope dont give up you will get for sure