IIT

CSE in top 10 IITs is far better. CSE has many opportunities in the market nowadays. ECE in top 5 IIT's is also a better choice, but compared to CSE, ECE has less scope in the market.

With preparatory rank, you will only get the preparatory course, which is different from an actual undergraduate programme in IIT.

I don't think environment engineering is a good career to pursue in India as very less work about environment is done here. While IITs will definitely give you a promising career and life but I cannot say how much you will enjoy it. You may then thin about giving Indian Forest Service exam through UPSC.

Hello,
Please visit this college predictor this will help you choose best for you
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Thank you.

Hello,
Please visit this college predictor this will help you choose best for you
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Thank you.

According to your marks, I will say no to drop, but if you will work hard, give your best then you might score well and get a good NIT / IIT next year.

Hi,
Visit this link for more info:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hi,
According to me, IT is the best branch, you can get admission in IIT.

IIT Patna Electrical, Mechanical
IIT Kharagpur MME, Industrial & Systems
IIT Hyderabad CSE
IIT Dhanbad Mechanical
IIT Jammu CSE
IIT Mandi Electrical.