Among IIT Mandi, IIT Ropar, and SVNIT Surat, IIT Mandi is a better choice for Civil Engineering. Here are the reasons why.

Infrastructure:

At IIT Mandi you will get good infrastructure for civil engineering as a large amount of money has been sanctioned to build advanced laboratories, classrooms, and many other relevant things. 

Faculty:

The faculty of this college is also very good and has much expertise in their field. 

Placements:

The placement records of the Civil Engineering branch have also been very good at this college as many top companies like L&T, ISRO, DRDO have selected students during campus placements. 

Competitive Examinations:

Students of this college who appeared for exams like GATE and UPSC have produced remarkable results. 

So, do your proper research, prioritize your needs, and then make a decision.

There are a lot of differences between the Dharam Singh College which is situated in Nadiad and the Sardar Vallabhbhai Patel National Institute of Technology. 

• The Sardar Vallabhbhai Patel National Institute of Technology consists of an NIT tag which is a lot better than the other. 
• Both the colleges furnish the same courses of engineering but getting an NIT tag that is a national institute tag helps a lot. It indicates a brand. 
• Apart from the brand, it has a diverse culture as it welcomes students from all over the country, the exposure and opportunities offered at SVNIT are of the national level. 
• The faculty and placements are also above average at SVNIT. 
• Along with all these, the campus of SVNIT is around 300 acres which is itself a big campus.

Therefore, it is suggested that you opt for SVNIT rather than Dharmsinh Desai University. As it will provide you better opportunities both in academics and placements.

There are different viewpoints for the same question. It primarily depends upon what is best for you, and whether or not the course you are willing to take interests you. 

One of my friends encountered a similar problem likewise, and addressing the same, here are some points you might want to consider before diving into any conclusion,

1. A dual degree in Mathematics, Physics, and Chemistry is claimed as a part of Science, while others are considered in the case of Engineering. You will learn the theories of science instead of the application of technology.
2. In Mathematics, you are supposed to learn the series of higher-order and their respective application. While, in Mechanical Engineering, you will learn more deeply about Engines, Boilers, Automobiles, Refrigerator Systems, and much more.
3. A single degree, like Mechanical Engineering, CSE, EE, Civil Engineering, or Chemical Engineering, can be more advantageous than dual degrees. 
4. If you opt for a dual degree in Mathematics, you have a higher probability of becoming a mathematician or a professor. But, in case you pursue Mechanical Engineering from NIT Surat, then you bear higher chances of securing a placement offer at top-tier MNCs.
5. Your choice should always remain ahead of most others. The one piece of advice is that in NIT Surat, you supposedly cannot change your degree from M.Sc to B.Tech following the 1st year and vice versa. 

You should research the same for BITS Goa and find whether or not the rule is similarly applicable in the institute. This is the basic difference you can find between both institutes. 

Dharmsinh Desai University is ranked 193rd in India by NIRF’20. Sardar Vallabhbhai Patel National Institute of Technology is ranked 54th for engineering by the NIRF’20. What comes as a bonus is students graduating from SVNIT get a tag of NIT.

Both colleges offer UG and PG courses. The total seats at SVNIT are around 1200, and DDU is around 4300.

Admission Details:

DDU:

• For admission in BTech and MTech, students need to sit for the GUJCET, JEE Mains, and GATE exam for MTech.

• Students need to qualify for their 12th with at least a 50% aggregate.

SVNIT:

• Candidates need to qualify for the JEE Main examination to be eligible for a seat here.

• Students need a 75% aggregate in their 12th examination.

• For MTech, candidates need to qualify for the GATE examination and need a 6.5 CGPA or 60% in their graduation.

Placement Details:

DDU:

• Although the placement rate varies with the branch, the average placement percentage ranges between 85-90%.

• The highest salary package can range anywhere from 10 LPA – 18 LPA.

• The lowest salary package offered is around 3 LPA.

• Companies like Infosys, Crest Data Systems, TCS, Kotak, Apollo, Nirma, Reliance, Deepak Nitrite, SR, and Amazon come for recruitment.

SVNIT:

• The total number of students placed in UG and PG are more than 500 and more than 100, respectively.

• The highest package offered in UG is 39.5 LPA, and the lowest is 3.6 LPA.

• Companies that come for recruitment are L&T, Suzuki Motors, Honda, TATA Motors, John Deere, Pidilite, Siemens, MuSigma, EXL, MasterCard, Airtel, Reliance, ABB, and MG.

Infrastructure and Facilities:

DDU:

The university provides all the basic facilities needed by students.

• The library is regularly updated with the newest edition of books, magazines, journals, and online resources.

• The university provides accommodation to both girls and boys.

• There are also other facilities like a gym, convenience stores, medical facilities, and shuttle services. Additionally, there are also several sports grounds including a swimming pool.

SVNIT:

• SNVIT’s library is 35 years old and has a large collection of books, and the college also has a central computer center.

• SVNIT also fulfills all the basic requirements of the students. There are a dispensary and two ATMs on campus. There is a post office right outside the college campus.

• The college also provides accommodation, a gym, and sports facilities.

Both the colleges have been established in the last 1900s and have a lot of experience when it comes to correctly guiding their students and placement. What comes as a bonus is students graduating from SVNIT get a tag of NIT. There are also numerous clubs in SVNIT, but other than that, both the colleges are almost similar.