Having known some people studying in these colleges, I can say that all these three colleges are reputed institutes to pursue engineering courses. They have a very good academic environment and provide the necessary facilities. 

You mentioned three branches, ECE, Civil, and Chemical. That means you don't have a specific interest. So, in that case, you should choose BITS over the other two colleges and here are the reasons as to why.

• As you don't have any specific interests, It is suggested you go for BITS for a dual degree. You will get one more year to build your interest.
• All the NITs you have mentioned, that are Srinagar, Hamirpur, and the northeastern NITs have lower rankings than BITS. 
• The infrastructure and the facilities provided are much better at BITS. 
• Thapar University was also a very popular university but now it is gradually losing its name. 
• Among the private engineering institutes, BITS has always been the best. It has been the first choice of the students due to its placement records.

Hence, choosing BITS among all the other colleges will be the best option as it provides better facilities than the rest of the college and placement opportunities to the students. 

Yes, you can. There are certain differences between the two exams that you should know.

• The IPMAT has a higher level of mathematics. You will have around 5 to 10 questions that you won’t have studied, for example, logs, if you haven’t done mathematics in your 10th grade. So there will be some extra topics which you will have to prepare.
• The UGAT, on the other hand, has a general knowledge section. It is a bit tricky for those who don’t have a fair idea of what’s going on around. But it can be covered if you start preparing now.

If you think of doing a crash course when just one month of the exam is left, you will be going to the coaching for half of your day and they will try putting in a lot of information in your head so that you have a vague general idea about the syllabus but you won’t have a good foundation on any of the topics. This acts as a major problem when giving an exam such as IPMAT as the questions are quite simple but have a tricky element to them.

Therefore, it is better to start preparing as early as possible and cover all the topics at least once. Some simple topics like algebra, time and space, etc., can be left out. You can solve a specific set of questions for these topics as exam questions do not differ a lot from them.

For other topics which are comparatively difficult, use material from various coachings and you can go through those chapters at least once.

There is no use of Biology in the exam or the course. It does not matter if you are a biology student or not.

You just need to play around with English and basic maths. You can get into the college even if you are from a Biology background because the admission test is standardized for everyone. It is quite difficult when it comes to the mathematics section of the question paper. So, prepare well.

A friend of mine from school happens to be a former student of IIM Udaipur. From what I heard from her, IIM Udaipur lays stress on entrepreneurship right from the get-go.

Entrepreneurship:

Various opportunities for start-ups are provided to the students. Right from the students choosing to leave a summer internship to the students who aspire to become entrepreneurs in the future; IIM Udaipur gives opportunities to each and every one.

It offers stipends for covering the basic costs of living. The stipends ensure that the students do not get distracted by their day-to-day spending and focus on the big picture of starting a venture.

The institute also provides placement holidays where the students are allowed to use the services of the campus placement at a later date. They, however, have to use the services within two years of graduation.

Faculty:

The Japanese model of faculty development is followed by IIM Udaipur. The process of selection is tough but after the appointment of the faculty, they are benefited by the support from the institution. The goal is that each member of the faculty will become well established in the fields they have chosen. May it be the NIRF ranking or UT Dallas ranking, they have the final say in this respect.

Research:

In terms of research, IIM Udaipur is in the top five.

Achievement:

In terms of international ranking also, IIM Udaipur has an enviable position be it in the QS World Ranking or FT MiM Ranking. It was awarded the accreditation of AACSB when it was the youngest institute in the country.

From the time IIM Udaipur came into the radar, it has been trying to change that situation in the hopes of creating a better brand name in the future and attracting more aspiring students so that they can lead.

Yes, If you believe it will help you advance your career. You can receive a loan to pay for your education at any IIM.

• In general, certain banks have connections with college officials and can provide education loans instantly and at a low interest rate.
• Tuition, housing fees, laptops, and student exchange are all covered by these loans.
• But in my opinion, I would suggest you think properly.
• If an MBA (from any top university, whether Indian or international) will not add much value to your current professional profile, you should not pursue it (whether with or without a loan, as there is also an opportunity cost associated with pursuing a full-time MBA).

Value Addition -

• There is a ceiling for some verticals, and to develop beyond, you'll require an MBA.
• You might need a skill set that an MBA education can provide for the role you want to get into. These abilities will assist you in landing your dream career or post.
• An MBA degree can sometimes be little more than a signal to employers that you are a deserving applicant.
• This signaling will offer you an advantage in this situation.
• It might be any of the following, a combination of two or more, or none of the above (if you don't think an MBA would bring much value).

I chose MBA because it seemed like a more straightforward path to my desired job. It helped me gain the required skills (yes, there are interesting and relevant things you can learn during your MBA course).

If any of the aforementioned points apply to you and your main issue is debt, I recommend pursuing an MBA. It will be worthwhile. Believe me when I say that you will be able to repay your debt.