What other options are there if one doesn’t appear JEE advanced?
If you are eligible for JEE advanced, then taking that is the best option, as you will be opening up your chances for the IITs.
If you are not taking JEE advanced, then you would be looking for NITs, IIITs, GFTIs, and state level colleges that take JEE Mains score.
In that, if you want to get in to the top NITs, then you may look around to score an All India Rank not outside 15k.
You can check out the opening and closing ranks for 2016, in the below link, to get a better understanding of what you can hope for.