B.Tech

Yes, you can definitely go for B.Tech in Information Technology. As you have studied Physics, Chemistry and Maths in class 11th and class 12th, then you can definitely go for Engineering.

You can go to respective college websites and apply for the admission in B.Tech courses. You can also wait for JoSAA Joint Seat Allocation Authority (you can check on this link - https://www.shiksha.com/exams/josaa/dates).

Hi,
Visit this link to check colleges based upon your rank:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Good Luck. Hope it helps.

Go for Astro Physics.

You can visit this link. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
Good luck.

As for now they didn't mention the details of it. You can go through the official website of it and can proceed.

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