Engineering Entrance Exam

Cut off in AIR doesn't really get affected much but you can always wait for last round of counselling. It may go down if students leave the college after first round.

http://www.targetadmission.com/colleges/1232-shri-gs-institute-of-tech-science-indore#fees
You can get idea of fee structure by this.
Normally, closing rank for general category students is 35000-40000.

No, you cannot appear for IIT-JEE after 2 years from clearing 12th.

WBJEE is better than ComedK. ComedK is just for private institutions in Bangalore. WBJEE is a state level entrance exam.

As per your marks your, you are not qualified to take JEE Advanced exam, but as per your JEE Mains marks, you can get an average college. It will be hard to get a good NIT. Try for CSE in Bangalore's private colleges because it will be better than some low-grade NIT.
Good luck.

Hello Subhas,
As per your rank, you will get lower NITs, however, check here to know more.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hey Satyam,
Definitely, you will get a seat in UPES. Kindly wait for the counselling and choose from the programmes being offered to you. See you got 4512 rank, right? So, it doesn't mean that all aspirants who has a rank below 4512 will join UPES only, they may have taken different engineering exam

Hello Mahesh,
Yes, GATE exam is for BE graduates to get into IITs for pursuing ME or M.Tech. GATE scores are also being accepted by many other universities for M.Tech or ME programs.