Hello dear subhajit 
As per your mentioned information you have got SC rank 4284 in wbjee 2019 And you are willing to take admission in CSE in JU, So we providing every possible detail which will help you to analyse your chances of admission in JU
Since JU has declared its cutoff for 2019 session so we are providing the analysis based on 2019 cutoff
For SC category ( CSE branch)
Category.             O.R                             CR
SC                        102.                           1064
Since your rank which is 4284 very very much more than the last year cut off so you can not expect your admission in computer science branch in Jadavpur University
As per the above mentioned data there are almost zero chances of admission in CS branch in JU

For more details check given below link
https://collegedunia.com/exams/wbjee/cutoff

Hopefully I have resolved your query

Sorry to inform you but with this rank you will not be able to get admission in jadavpur university in CSE branch. Here in the last year cut off in jadavpur university in CSE. ( for SC catagory only) 

CSE                     SC         OR  198       CR   1995