Exam

Yes, you can. But it is better to drop than to study in college for JEE because you will not be able to study for JEE whole heartedly.

Find a link below that will help you with the syllabus of ICAR for recent year:
https://www.shiksha.com/science/exams/icar-aieea/syllabus

Go for B.Arch as you have got a good rank. You can get a good NIT for B.Arch. But choose B.Arch only if you are interested in architecture.

Find below a link that will help you find a college that you can get into with your rank/score:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

You have a very less chance of getting into Birsa Institute of Technology, Sindri (Dhanbad).You should have a rank of under one thousand to take admission in BIT-Sindri.

Find below a rank predictor that will help you find your rank respective to your score:
https://www.shiksha.com/b-tech/resources/jee-advanced-rank-predictor
Hope this is helpful

Your first preference should be to concentrate on 11th and 12th examinations (without which all your efforts might become futile).
Parallel to that you can start preparing for the joint entrance examination (JEE), by following meticulously the following steps:
* Have at least four to five years' quest

As you live in Gujarat, you need to get a score of 200+ to get admission in a good reputed college in Pune like DY Patil College or College of Engineering.

A score between 150-200 is required to get CSE in G. B. Pant University. Above 130 marks are required for ECE. The same goes for mechanical engineering.