Savitribai Phule Pune University is the best option among this for an MSc in Mathematics. Pune University is old and well-reputed. Science faculty of this university is great. You will have more options for your MSc project. SPPU is well known for its research interface. 

IIT Mandi and NIT Jaipur offer the advantages of brand value. But these institutes are mostly known for their Applied Science courses. 

All of the options you've mentioned are reputable institutions with strong programs in their respective fields. However, the best choice for you will depend on your individual interests, goals, and priorities.

• The branches CSE, Electronics, and MNC(Math and Computing) offer better job opportunities with higher packages in comparison to other branches. Thus if you are in desperate need of a job, these branches will serve you best.
• Mechanical Engineering is a branch best suited for those targeting a government job. This branch too has decent job opportunities considering the fact that India sets up more manufacturing sectors under Make in India initiative.
• Engineering Physics is a core branch that has little to offer in terms of exposure and opportunities. I won’t suggest you go for this unless you are extremely passionate about Physics. You can take it if you are planning a branch change if you want to clear UPSC CSE.

Lastly, my suggestion would be to target top NITs instead and not go for a mediocre branch. Additionally, you may want to reach out to current students or alumni of each institution to get a sense of their experiences.

IIT Bhubaneswar:

• It is one of the newer IITs, established in 2008.
• The Civil Engineering department at IIT Bhubaneswar is well-equipped with modern facilities and has experienced faculty members.
• The institute offers good opportunities for research and higher studies in the field of Civil Engineering.
• Placements at IIT Bhubaneswar for Civil Engineering graduates are also good with reputed 

companies visiting the campus for recruitment.

IIT Mandi:

• It is also one of the newer IITs, established in 2009.
• The Civil Engineering department at IIT Mandi is relatively small but has highly qualified faculty members.
• The institute offers good opportunities for research and higher studies in the field of Civil Engineering.
• Placements at IIT Mandi for Civil Engineering graduates are also good with reputed companies visiting the campus for recruitment.

NIT Warangal:

• NIT Warangal is one of the top NITs in India, established in 1959.
• The Civil Engineering department at NIT Warangal is well-established and has experienced faculty members.
• The institute offers good opportunities for research and higher studies in the field of Civil Engineering.
• Placements at NIT Warangal for Civil Engineering graduates are also good with reputed companies visiting the campus for recruitment.

Ultimately, the choice between these three options will depend on your personal preferences and priorities.

These are very different choices and you should first make up your mind on the choice of stream.

Here is the relevant information on each stream from the different institutions:

• Economics at IIT Kharagpur: It offers a BS (Bachelor of Science) in Economics. It is a 4 year full-time on-campus program. The course fee for the first year is INR 2.24 Lakhs, while for the next three years, it is INR 2.17 Lakhs each year. During IIT Kharagpur placements 2023, the Highest Salary reached INR 2.68 CPA.

• B.Tech Electrical at IIT Bhubaneswar: It is a 4 year full-time on-campus degree offered at IIT Bhubaneswar. The course fee for Electrical at IIT Bhubaneswar is INR 2.74 Lakhs in the first year and INR 2.68 Lakhs each for the next three years. In the 2023 placements, up till the present date, the highest package offered to the Electrical Branch is INR 44.62 LPA and the average package offered is INR 19.05 LPA. The placement percentage for the electrical branch stands at 85.25%.

• IIT Mandi Electrical: The four-year electrical at IIT Mandi has a course fee of INR 2.85 Lakhs in the first year and INR 2.63 Lakhs each in the remaining three years. Hostel fee is around INR 7500. In the year 2022, 47 out of the 48 eligible students from the Electrical branch were placed. The total number of placement offers received by the Electrical branch was 62. In the year 2023, the highest salary offered at IIT Mandi placements was INR 60 LPA and the average salary was INR 25.23 LPA.

• IIT Guwahati Civil & IIT BHU Civil: Civil Engineering at IIT Guwahati is a 4 year full-time on-campus program. The course fee for the same is INR 2.57 Lakhs in the first year and INR 2.12 Lakhs in the next three years. During the 2023 placements at IIT Guwahati, the highest domestic salary reached INR 1.1 CPA, while the highest international salary was INR 2.4 CPA. The top recruiters were American Express, Qualcomm, JP Morgan, and C-DoT, among others.

IIT BHU Civil Engineering is a 4-year full-time on-campus degree. The course fee for the first year is INR 2.28 Lakhs, while for the next three years, it is INR 2.13 Lakhs each. During the 2023 placements, the placement percentage for the Civil Engineering branch was 76.98%. The median package was INR 15.75 LPA and the Average Package was INR 19.09 LPA.

All the above institutions carry the prestigious IIT tag but to compare all of them that too using different courses is quite difficult. You must first choose the course that you wish to pursue and then decide which of these institutions best fulfills all your goals. 

You can use the above statistics for course fees and placements to get a rough idea of each.