Dual

Of course in India, the best college for dual degree are NITs.
Some of the NITs offers dual degree course in B.Tech biotech.
Other private colleges for dual degree courses are meaningless.

1. B.Tech is way better than M.Tech dual degree, if of course you have the innate passion to scale up to pursue a PhD later on.
2. If getting placed after dual degree is your main concern then you may be in trouble, since the chances and packages offered to dual is not at par with the standards you have in mind. It's almost the same as of B.Tech.
3. This is in case of IT jobs, whereas in the core sector, dual degree will definitely give you the extra edge over B.Tech candidates. So decide this in the early phase of your career.

Only BITSAT score is the way out:
http://www.bitsadmission.com/Eligibility_Criteria.aspx: Eligibility criteria
http://bitsadmission.com/cutoffscores.aspx:cut-off scores 2016

Actually, both of them have a great brand name, Symbiosis and NMIMS both will give you great course and brand value but I would recommend you to go for NMIMS just because it's in Mumbai which will give you great job opportunities compared to Pune.

Following space crunch on the campus, IIEST (Indian Institute of Engineering Science and Technology), Shibpur has decided to scrap its five-year integrated dual-degree(B.Tech and M.Tech) programme from the academic session 2017-18. Discontinuing the programme, the institute will bring back its BTech programme after three years. Till date, the institute has admitted around 650 students - every year - to its dual degree programme.

Good morning,
Look, university courses are affiliated with the respective university itself.
There is no question of AICTE coming in between.
The courses in Hyderabad University are affiliated by Hyderabad University itself. and all those courses have very high weightage and value.
Thanks!

You'll usually need an HNC, HND, foundation degree, or degree in aerospace engineering, avionics, or a related subject, like:
Electrical or electronic engineering.
Mechanical engineering.
Manufacturing or product engineering.
Physics or applied physics.
Software engineering or mathematics.
All the best.