IIT Mandi - Indian Institute of Technology Answered Questions

Academically, more or less both will be same. Placements depends mainly on your efforts. You can take whichever suits your personal taste. Perks of being at IIT, Mandi include permanent campus at a beautiful location, the climate is awesome and coding culture is developing really fast.

Yes, you may get. You have a fair chances of getting a seat in IIT just wait for counseling procedure that is CCMT but I have doubt that whether this IIT offer this course in which you want to take the admission since many other IIT too offered this course but this IIT does't because last year also this IIT did not release the cutoff for power electronic. So I suggest you take just verify whether the course is available in the IIT or not. Also check other IIT like Delhi, Bombay this might offer seat in power electronic.

College change or branch change after the first year is completely dependent on college norms, some college allow it and some won't plus you need to have good scores in the first year to apply for the same. For further details contact the college authorities.

First of all congratulations! I will recommend you to go with CSE from IIT Mandi, but in that case only if you have a keen interest in computer science and engineering. Placement wise it's very good also you will get very good exposure. IIT Mandi has very good semester exchange program too, you have a very good option there to go abroad and explore further. Else if you wish to go with core opt for the other options which are left.

Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings. Civil engineers design, build, supervise, operate, and maintain construction projects and systems in the public and private sector, including roads, buildings, airports, tunnels, dams, bridges, and systems for water supply and sewage treatment. Many civil engineers work in design, construction, research, and education. Civil engineering is an age old profession and with Government of India focus on infrastructure scope and opportunities for Civil Engineer will be very high for next few years.
You are advised to appear in JEE Mains and JEE Advanced to seek admission in IIT Mandi for B.Tech civil engineering.