Engineering

You have a good rank in JEE Mains. You can get the top engineering institutes. In my view, you must prefer NITs or IIITs for CSE and ECE. IIITs offers CSE, IT and ECE mostly. Check below link for colleges you may predict on your rank-
https://www.shiksha.com/b-tech/resources/jee-mains-college-predict

NIT Warangal is one of the old and top NIT. You belong to OBC category. So, you have to score above 180 in JEE Mains. It depends on the rank.

You may get MIT Pune.Or DYPatil Pune. If possible you can go through cut of list of various top rank colleges in Pune & Verify for 2017 cut of branch wise ,round wise also.Give your choice accordingly while feeling admission form for cap round.You might have a chance if you have any reservation crit

You might have a chance, if you have any reservation criteria, else give it a try. You have very great chance to get into this institute with this rank.
Attend the counselling and choose your options appropriately.
Try shiksha college predictor for better analysis.

Nothing is available in India. If you are interested in online courses, try something from open in the foreign universities. But they cost high too. Beware, assume your field of interest and outweigh it with available options. To me, courses on energy auditing, energy economics and optimisation are

Yes, you can appear but you have to work hard to clear this time anyhow and believe yourself. You will definitely go for Advanced.

For the candidates to qualify for the admission in the IITs/NITs/IIITs and such other CFTIs whose admissions are based on the JEE (Advanced)/JEE(Main) ranks, they should have secured at least 75% marks in the 12th class examination, or be in the top 20 percentile in the 12th class examination conduc

I think is difficult. Give it a try maybe u get it.
There is a chance of getting admissions there. Try your best until last round of counselling session. Good luck for your admissions.
You might have a chance if you have any reservation criteria else give it a try.You have very great chance to get int

I had given my WBJEE in 2015 and during that year they did not accept through SC Quota. You can contact the admissions office regarding any query.