NIT

If you are talking about last year's opening and closing ranks, then these are already declared on the josaa. Nic. In
And, for this year's ranks, firstly the result of JEE Advanced will be declared and then the time table of whole counselling procedure will be made available on the JOSAA website. Generally, the counselling starts in last or second last week of June.

I also had almost same rank as you 1578 (AIR_OBC). I will suggest you to select NITK Surathkal IT. Even CSE at Allahabad is also a very good option if you are from UP. So if you want to stay near to home then go for CSE at NIT Allahabad otherwise come to NITK, Surathkal in IT.

Friend, there is no chance of getting NITs or IITs. You can get state government colleges or you can go for other private colleges available.

The best NITs for Electrical and Communication Engineering are the National Institute of Technology at Durgapur, Allahabad, Jamshedpur and Warangal.

With this rank , the best you can get Mechanical or EEE in the NIT's other than top four that is VSNIT , MVNIT , MANIT , NIT - Jamshedpur , NIT - Surathkal , NIT durgapur . Though , you have a good rank , I would suggest you to chose better college with better stream , that is focus on college and stream both equally . Best of luck

No, you'll not get any of the above-mentioned colleges (assuming that you are general ). You are likely to get into one of the private universities or autonomous state government institutes.

https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Please go through the link that I am sharing here to know about the same.
Good luck.

No, be it CBSE or NIT, you should have your min. 12th board percentage be 75% for general and for OBC and other be it around 65%. Moreover, many of the NIT's have 20 percentile rule ( more often with lower rank ). NIT Mizoram last year has 54.2% min. Board marks for general. But since, for Higher rank NIT's, it is not possible.

Can I know the rank, because mostly the colleges are predictable only by the rank. If you got higher rank also I suggest you to go for JOSAA because in the previous year many seats were vacant due to lack of knowledge during options entry. If you're lucky enough you get one of them.

JEE Mains 2018 College Predictor
Use your JEE Mains 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of JEE Mains 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.