Engineering Entrance Exam

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 exams and they may have got a chance in other colleges. So, probably you will get a seat, do not worry.

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.

Hello Rushikesh,
For admission into NITs, IIITs and GFTIs, your JEE Mains score alone is considered and not JEE Advanced score. So, if you mention your score and rank including category rank then I may tell whether you can get any NIT or not.