Colleges in Gujarat

https://www.shiksha.com/engineering/jee-main-college-predictor
here is the tool you can use to get a good prediction for you according to your score range.

The expected CAT percentile cutoff of IIMs for asked category are given below.
1. IIM-A
Sectional cutoff=60
Overall cutoff= 70
2. IIM-B
Sectional cutoff= 60
Overall cutoff=70
3. IIM Kolkata
Sectional cutoff= 65
Overall cutoff=70

The study of comparative literature allows for the development of an analytical and multi culturally aware interdisciplinary understanding that permits students to succeed in virtually any profession. A sampling of representative skills and abilities follows.

Nom the board marks are just for eligibility. You need to score an percentile above 95 to get admission in not Surat. On the basis of board marks you can just clear it's eligibility criteria.

No, you cannot be eligible for NIT Surat in chemical engineering. As you have an low score in Mains. You should now focus on April Mains exams and score good marks to get NIT Surat.

Every candidate, who are declared 'pass' in Professional Programme Examination in addition to acquiring practical experience, shall be required to undergo compulsory practical training for four months. Read More: ICSI CS Result 2019; Girls outshine boys in the Foundation Programme.

It seems too difficult to get any IIM, still, you can try and hope for the best.

Yes, you will get admission if your CAT score is above 98+. Hope for the best.

As per your previous marks, chances are less, but still, if you try to score above 98+ in CAT then, maybe you will be callwd as an interview.

At least you have to score 95+ in CAT to get the call for an interview.