IIT

Yes, you can. The eligibility for IIT JAM is to have a minimum of 55 percent (for general category) in Bachelor's degree and 50 percent (for reserved categories). For more details, you may refer the link below:
https://www.shiksha.com/science/iit-jam-exam

Yes, you can pursue a PG course related to polymer science but you have to crack the exam so that you are eligible to take admission.

Getting admission in IITs will be based on rank, as we can't assure how other students who appeared have performed. So, If you are like less than 3000 AIR, then you can get admission in any one of the top IITs.

The merit changes every year and the last year was 60 for OBCs.

Kindly visit this link:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hello yes you are eligible for IIM but you need to crack CAT with good marks
good luck.

Hi Amoghha Prakashgupta
Kindly predict your college in this college predictor. JEE Main rank predictor is an online tool which predicts the candidates rank range and probable colleges based on the difficulty level of the examination, average marks scored in JEE Main and seats available in IITs, NITs, GFTIs, and other SFTIs. The rank predicted might not be accurate but it certainly does give an idea to the aspirant. Know your college admission chances based on your JEE Main Rank, Home State, Caste, Gender, etc. Here https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

Hello Vikas,
Yes, you are eligible. The minimum percentge that should be scored in board exams is 65 for the students of reserved categories like SC, ST, OBC and PwD.

If you clear JEE Advanced with a decent rank then you can get a seat based on your ranks only and not as per your wish. There will be a counselling process and based on your ranks and available seats, you will get admission.

With this rank under OBC category, it is difficult to get the top IITs. You have chances to get the lower ones or the least demanded branches in the above average institutes.