Colleges in Gujarat

GCET was ranked at number 53 in 2013, at number 42 in 2014 and at number 28 in 2015 among the top 100 engineering colleges of India by Data Quest. In 2006, GCET was named as one of the top 100 engineering schools in India by Outlook. GCET is affiliated with the Gujarat Technological University. So this is average good option for mechanical engineering.

If your main domain in CSE, then I would recommend that you join UPES, Dehradun instead of ICFAI.
I would only give you two reasons for my recommendation.
1st- UPES offers CSE program with more than 15 specializations and all are industry-aligned and domain specific courses.
2nd- UPES's placement record for CSE alone was 93% with the Highest Package being 14.81 lacs and 4.06 lacs was the Average Package.
Plus IFCAI is best known only for their law courses, but UPES is Asia's first university to introduce programs in energy sector and all of B.Tech courses in UPES are highly known and liked by students in India.

In my opinion, DAIICT is equivalent and better than IIT, Gandhinagar reason being that IIT, Gandhinagar is a new IIT, so it is not that recognized. DAIICT is well recognized as compared to IIT, Gandhinagar. It totally depends on you what you opt for. Go through the course details of both the colleges, interact with some of the seniors who have attended the college, you will gain a better insight of the academic scenario of the colleges. All the Best!

Your B.Tech score is below par for your admission into IIM-A. But otherwise, work experience is never mandatory to get admission into any B-Schools in India baring a few.

Most of the colleges have eliminated the GD process and replaced it with WAT(Written Ability Test) which is more of a test of your thought formation and english writing skill and not just about having the highest voice in a fish-market. But PI still remains the most integral part of the process. Hence if you feel that you are not confident enough in English, I would suggest you work hard towards it and if required join a coaching center for the same and overcome your hurdle.

I would suggest you opt for MBA in general management offered by top IIMs. This will expose you to all types of possible streams in management and you can choose the one which you like. Pursuing the stream or area of your liking will not only help you build your career in a successful manner but also will help you be satisfied which you might not gain by just having a better job (not of your liking).

You can aim at scoring 99%ile or more for a call from IIM A. But getting into IIM A will depend on your interview performance along with acads hence cant be ascertained precisely.

Your 12th score might prove as a deterrent for your IIM A/S call. But dont loose your hopes and give your best in CAT. There are very good colleges which do not consider past acads!