Jadavpur University

Evening/distance/online/part time engineering courses are not valid any more as per the latest supreme court verdict, hence would recommend you to join regular B.Tech course for better career prospects:
http://www.tribuneindia.com/news/nation/no-technical-education-through-correspondence-says-supreme-court/491819.html

It is the two years course which is divided in 4 semesters. Its fee is around 25000 to 40000.

Yes, the medium of teaching is English.

Hi,
Yes, you have a fairly good chance with the above-mentioned score to get a seat in Jadavpur under Diploma quota.

This year, you to should target for the 160+ in the JEE Mains and 135+ in the WBJEE to get the admission in this college.

M.Tech degree holders should be able to progress a little faster than fresh BE/B.Tech graduates, because the latter have a somewhat higher learning curve. Otherwise, as a researcher at one of the IITs, IISc, TIFR, or ISRO, or post-Ph.D as an academic professor/researcher, there is ample scope for M.Tech graduates.

Yes, you can. Diploma students, especially Plastics Mould Technology, are eligible to pursue BE/B.Tech in Chemical Engineering from any university. You can opt for lateral entry to,o which is the most common procedure for diploma holders. I would suggest enquiring about admission in the university as classes have already begun everywhere.

Yes, you have to apply in an evening college.

Yes, you can apply directly to the college and get admission.