Colleges in Gujarat

Western India Institute of Aeronautics Pvt. Ltd. offers the following UG programs as under.
Course offered-
1. Aircraft Maintenance Engineering Mechanical Stream (Aeroplane & Power plants)
2. Aircraft Maintenance Engineering Avionics Stream (ES, IS &RN)
3. B.Sc (Hons.) AM IN MECHANICAL & AVIONICS
The eligibility criteria for above programs is 10+2 with PCM. Further there is no specific % is required for above courses.

There is no such information on the official website. You can contact them directly for updates information.
https://www.iantindia.com/Contact

You have to go through ACPC admission process. They decide your merit rank banded solely on your CMAT score. Keep checking http://jacpcldce.ac.in/ from July onwards.

You can definitely apply for the entrance exam as maximum students have not yet got their HSC results. The entrance exam result will be coming somewhere near to your board exams and then your admission will be confirmed.

You can refer to this link for details http://www.hacollege.org/StudentCorner.aspx

Obviously, Thapar Institute of Technology, because it has good rating and you will have a royal life in your college days. Because, both are chemical engineering that's why I am preferring you Thapar Institute of Technology.

The eligibility is, candidate must have completed B.Sc with Physics from a recognized University. The classes schedule is normal from around 9.30 AM to 5.00 PM.

Yes You can It's not Soo difficult.