Architecture Entrance Exam

Considering both your OBC rank and NATA score, the chances to get into Jadavpur University are slim.
As your rank is just near the cut-off for OBC in Jadavpur University and 86 marks in NATA are very low because 90+ are consider for admission in B.Arch.
So, you can try in any other private university/college. If you find my answer reliable, you can appreciate it by hitting the thumbs up and follow button.

Yes, you have a very good score in NATA & you are from OBC category, it will help you.

Not possible as if you go for Compart exam and the result of Compart exam came so late that your counseling in following college is over so after the result of Compart you can't take admission here so you have to try in Private college.

Hello Vidit Gupta,
You can click on the link and enter your rank to know the colleges, if IPU is in the list, you can be sure of admission
https://www.shiksha.com/b-tech/resources/jee-mains-branch-predictor
Hope it helps.
All the best.

Hello Bommena Meghana,
Yes, you can get admission in some or the other college which is good enough, you can click on the link and enter your rank to know the colleges, if Jadavpur college is in the list, you can be sure of admission
https://www.shiksha.com/b-tech/resources/jee-mains-branch-predictor
Hope it helps.
All the best.

Hello Ayaz,
Did you take JEE Mains paper 2 for B.Arch? If yes, you can apply for counselling to be held on June 15.
If not then try taking NATA next year.
Management quota is not the right solution (if your parents can pay a lot of money).
All the best.

It's better if you can join during +2 vacations or holidays.
Now, for the time being, you better keep your focus on +1 and +2.