Hello Aspirant,

It would be difficult to tell you the exact about the qualying cutoff & admission cutoff as JEE Main is being conducted twice by NTA for the first time. You can refer the previous year cutoff with the given below link.

https://engineering.careers360.com/articles/jee-main-cutoff

Good Luck!

There is a fair chance of getting a lower or non core stream in newly opened NITs, IIITs. It might be possible that you land up in NIT Silchar or other NITs in north east. So, fill your prefferences in counselling very carefully and wisely.

Your rank will be in the bracket of 1.5 lac to 2.5 lac in gen category so respectively in SC category it will be aroung 15k to 25k. So, as per the rank there is less chance to get into top NITs, IIITs (IIT don't consider Jee mains score). But there is fair chance of getting newly opened NITs, IIITs in spot round or even in 7th round of Josaa. So, opt colleges in Josaa counselling very carefully and if you are not getting any college in any round then wait for spot round and apply for it. 

Best of luck.