Engineering

JEE Mains is a national level engineering entrance exam to make you eligible for computer science engineering in maximum colleges across India. But if you don't want to opt for JEE Mains then there are various other entrance exams as well, check the link below:
https://www.shiksha.com/b-tech/exams-p

Yes, you have to give MHT CET to get direct second-year admission in Sardar Patel College of Engineering for B.Tech civil engineering, check the details below:
https://www.shiksha.com/b-tech/course/b-tech-in-civil-engineering-lateral-entry-sardar-patel-college-of-engineering-andheri-west-mumbai-2883

Yes, you are eligibl. If the candidates are living in some other state but are bonafide residents of Gujarat, then he/she will be eligible for admission. Academic Requirements For GUJCET
10+2 (or equivalent) examination should have been completed by the candidates from the Gujarat Secondary and Highe

Pursuing full-time M.Tech degree with a job is not possible instead what you can do is that you ask your employer to allow you to work for home or provide you flexible working hours so that you work after the college hours.

In IPE, every student is mentored and trained for placements by the faculty. Its your academic performance and performance in the interviews that will always count. So, being a fresher will not fetch you less salary. The average salary is 5.2 LPA and highest is 12 LPA.

Rajiv Gandhi Aviation Academy | Bowenpally, Hyderabad and Flytech Aviation Academy | Vanasthalipuram, Hyderabad are the best AME aviation colleges in Hyderabad
For details check the link below:
https://www.shiksha.com/engineering/colleges/aircraft-maintenance-engineering-colleges-Hyderabad.

That depends on where your interests lie. If you are interested in learning business, you should go for MBA. However, if you have a technical bent of mind, you should study MS. Both options are good and lead to lucrative careers. Regards.