Engineering

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Hi!
Apart from appearing in any entrance exams like VITEE, JEE Mains, etc. B.Tech colleges won't have any age limit for admission. All the best.

Hey!
Chemical Engineering is the one of the most highest paying jobs in the world.
Yes it does not start as an instant success but if you are capable and talented you can survive the competition. you have to work hard for being a chemical engineer!ALL THE BEST!

This would depend a lot on your personality traits & interest areas. Each MBA specialisation needs specific personality traits for excelling in the profession say if you are outspoken and like travelling, meeting people and take target pressure then Marketing & Sales could be a preference, if you are a peoples person wherein you like counselling people and act as an advisory & wants a desk job bonded by rules & regulations then HRM will be exciting. If you are keen on the logistics/ operations side then SCM/operations would be suitable. So, do evaluate your inherent personality traits and then take a call.

No, Diploma in foreign countries isn't valid, so you need to pursue Bachelor right from first year abroad universities. Good Luck!

He is suggested to do any good course from Udacity, Coursera, or some very good institution and he must possess some really good coding skills in C, C+, Java and Python because jobs in IT industry aren't easy to get.

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Don't worry, a gap will not affect your interview, the only thing which will affect is your knowledge.
Good luck.