Your choice to go ahead with this is a good one. There are quite a few reasons that will help you become successful if you plan to give the CAT after gaining some experience:

• A lot of students from top B-schools gain admission after doing some work and gaining experience. You can even try for XLRI General Management which requires 5 years of work experience.
• If you are planning to go for a PGP-Ex, let me tell you that this will not help you make any domain changes. But, if you still bag an admission, you can do a degree in operations and consulting.
• The institutes mentioned above are quite biased towards engineers. They will not pay much attention to your profile. So, if you are one, your chances of getting in are quite good. You can also give the GMAT for your future prep.
• If you are already working, with a degree from a reputed B-school, you will surely get an increase in your salary. You will also get the validation you need in your future endeavors.

In conclusion, this method of pursuing your further studies might be a little difficult in the beginning but you will realize that the pros are much better than the cons. You should think of going forward with this and take a chance.

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.

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.

Yes, you are eligible for NIT, if you opt-out from Magadh University. First, you should cancel your admission and make sure that your admission at NIT is confirmed. 

My brother is a partial dropper and he joined NIT later. You will need to submit the gap certificate mentioning the reasons regarding the same. It is quite likely that they will accept your admission, despite the reasons you had. However, you will have to start from the first year. My brother informed the administration that he was preparing for IIT JEE while still studying at the college. The administration did not raise any questions. 

There are various partial droppers who joined the institution while still preparing for JEE side by side, and are now part of institutes like IIT, NIT, and BITS. So, you have nothing to worry about. Just focus on submitting the required documents and follow the necessary steps.

Now it is up to you what you want to give as the reason for your drop year. But it’s best to state the truth. 

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. 

Well, in such a case where you get blocked and don’t understand what to choose then you should discuss it with your parents and seniors in the particular field. They will help you to sort out which field you should choose and what benefits you will get by choosing that.

But as far as I know, there are always some things common like you do programming on microcontrollers and use Raspberry pi if you are in ECE. But there is a limit to coding in ECE.

If you see in CSE and IT both the fields are core coding branches. If you are passionate about computer science I would suggest IT is the field you should opt for. At the same time, NIT Allahabad is a good college and it does have its reputation.

So, this was all the data I can assist you with but my personal suggestion to you would be to take a long-term decision. Both ECE and Computer Science are good courses but you should identify which one you are passionate about and how are its prospects in the future. Only then you will be clear to choose the best for you.

Most B-schools have accreditation from NBA so if you are planning to do a PGDM from them, it would be equivalent to an MBA. Additionally, they also have good NIRF ranking. Many of them also invite industry speakers since they are known to have good connectivity in all courses.

• The faculty is also very well qualified when it comes to teaching and industry experience.
• If you are planning to do an internship in the summer, this option is available too.
• You can avail a three-month summer internship, do numerous live projects as well as Harvard simulations. These can be included in the curriculum too.
• Jaipuria Institute also has another additional perk of mentorship. This has been made as a part of its curriculum.
• It helps students understand their potential, work on their strengths and weaknesses after evaluating them and all this ultimately helps students secure good placements after the program is over.

As far as other B-schools are concerned, many of them probably do not offer this unique opportunity of a mentorship program. They will not focus on individual development plans for the students. If you are looking for a similar provision, you should consider going to Jaipuria Institute.