My brother was in the CSE branch of NIT Trichy and based on his experience, here are a few pointers:

• The professors are extremely learned and experienced and impart quality education
• The relative grading system establishes peer pressure, and as a result, there is tough competition among the students 
• IIT Roorkee is well known for its rich coding culture that is promoted by student-driven and institute funded clubs. These clubs give you additional knowledge on web designing, App development, and game development that might be useful later in
• The CSE department is one of the most coveted branches, and being a part of one will inculcate a sense of privilege.
• The hostel and campus life is decent with all necessary amenities.
• A total of 5 fests are held throughout the year and are totally funded and organized by the institute. The institute is located in an area that helps you explore nearby tourist spots like Pondicherry and Ooty.

You won’t ever regret choosing NIT CSE.

In my opinion, you have made the right decision by dropping the PITS Pilani EEE branch for IIT Madras Metallurgy. My cousin was forced to take IIT Madras Metallurgy by his mother. Initially, he was disappointed but his mother advised him to continue with the same enthusiasm he cleared JEE. Many students after getting admission relax and this opens opportunities for those who continue to slog even after admission.

Your ultimate goal should be to change your branch for which you will have to work hard. This can be done by staying among the top 5% of the batch with around 9 CGPA. You can switch to Mechanical and even to Electrical sometimes with a good CGPA. All you have to do is

• Focus on your subjects
• Do well in the tutorials
• Perform well on quiz 
• Ace your practicals 
• Score high in the Final semester exam

IIT Madras has a plethora of subjects to choose from in addition to a dual degree. You can change your branch provided your academic performance is at par with the requirements in the 3rd year. Some other highlights that might convince you further to choose IIT Madras are

• Creative clubs like C5 help in harnessing skills in your area of interest. These clubs have made amazing innovations and you can always learn so much by being a part of them.
• The unique Research Park which is the IIT Madras incubation center 
• Extracurricular activities such as Yoga, 5-star Gym, long-distance running, etc.
• The Institute operates under the leadership of highly learned alumni and so are most of the Deans.
• Air-conditioned Central library that is stacked with resources

All these are unique to IIT Madras and thus it’s a better option than BITS Pilani.

I would like you to consider certain important things before making your decision-

• College- Without a doubt, NIT Warangal is ahead of NIT Durgapur in terms of faculty, infrastructure and hostel facilities.

• Subject - You need to choose your subject based on your interests. Without that you’ll either hate your profession or choose a completely different career path altogether. If you are into math, coding, logic and problem-solving, choose CSE. On the other hand, if you want to study materials, metals, extraction, etc, choose Metallurgy. 
• Profession - CSE will give you better opportunities in the IT sector. You might get a fat check, work for a good company, and live in metropolitans. As you know, IT jobs are basically office jobs.On the other hand, core Metallurgy jobs deal with steel plants, mines and such. You’ll end up working in a remote area if you choose a core job.The placements for CSE are overall much better than Metallurgy, across all engineering colleges. But if you have a passion for metallurgy, you might end up in a good brand or get selected for a government position. 
• Location- Both the places are culturally very different. Research a bit, and figure out which place’s food habits, climate, and culture suits you better.

According to me your college will last for 4 years. However, your branch will become an intrinsic part of your personality and profession. Unless you have an interest in Metallurgy or a good chance at sliding to another branch, choose CSE at NIT Durgapur.

I think the branch matters more than the institute and that being said personally I feel IIT Bhilai Electrical is a better option than IIT Indore Material Science. The small batch size enables you to make the most out of the opportunities and resources. The points below further prove my opinion 

Here is a small list of things why you should consider IIT Bhilai:

• The professors come from IIT Hyderabad, one of the most reputed and well-regarded new IITs.
• The fractal system is followed here giving you a more flexible academic palette. 
• The core subjects are introduced in the first semester itself so that students can identify their interests early. 
• IIT Bhilai EE lab is one of the very few labs in India which is Cloud Connected.
• There are 20 All-in-ones that have 8-core i7 processors in the EE lab.
• The institute has vibrant campus life with dynamic student activities going on such as 6 cultural clubs and 3 tech clubs.
• The Electronics Club of IIT Bhilai Is well-equipped and enables you to experiment with various modules like GPS module, GPRS module, accelerometer, etc

Overall, taking IIT Bhilai will not disappoint you and you will have a plethora of opportunities here.