NIT

Keep going, brother. JEE Mains is a tough exam and getting 89 marks is not that bad. To know whether you will be getting in any NIT, go through this link josaa.nic.in through which you can know the opening and closing ranks. If you r not able to get any seat in NIT then I will advise you to drop and continue for JEE 2018.

Kindly use the college predictor app. I hope this will resolve your query. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
All the best.

Yes, but only if you have filled the given NITs as a choice in your counselling form. Even the top NITs have vacant seats. So, you can get admission in any nit even in spot round counselling.

I will suggest you to take computer science because you have to do programming. You have to use a lot of mathematical logics. So take computer science engineering or IT.

Sorry to say but you haven't cleared JEE Mains required cutoff. So there is no way to get admission in any college through JEE Mains. You may get admission in any private college through 12th percentage.

Hi,
There are some NITs that you can get as your OBC rank is 28000 (nearly). You may refer the link below that gives you the previous year closing and opening ranks for each NIT. So you may check whether you are getting it or not. But there are some NITs like Srinagar, Agartala, Hamirpur, etc. where you may get admission.
http://josaa.nic.in/Result2016/result/OpeningClosingRank.aspx

Sorry but your marks are not enough that can help you to get a college because above 300 marks are considered for admissions in B.Arch. So, you should try for any private college.

Yes, you will get admission in NITs. I am not sure about the NIT but you have advantage of OBC quota and 4.5k general rank.

I will give preference to Amrita University (only main campus) over lower NITs just because of their teaching quality and also because of their placement. IIIT and lower NITs are still struggling for faculties and placement.

You have very less chances of getting an NIT for B.Tech .You may get integrated B.Sc+M.Sc courses in NIT-Patna,NIT-Rourkela and NIT-Agartala. So fill these choices during counselling.