Dear Aspirant,
Congratulations for cracking the joint entrance examination.
You mentioned that your general merit Rank is 20,388 and your OBC category rank is 1324. You have an advantage of Tution fee waiver quota also.
You got 42 marks in your mathematics examination of higher secondary.
You are looking for a seat in Jadavpur University.
But I am very sorry to say that you can not get a seat in this reputed University. Because as per the eligibility criteria of Jadavpur University,one candidate who wants to apply for JU,he or she must have 45% percent marks in mathematics examination of higher secondary.
So you can not get admission in this College.
But don't worry about it. You can opt for Maulana Abdul Kalam Azad University of Technology,it a government University controlled by West Bengal government and famous private colleges.
Best of luck.