Electrical and Electronics Engineering

No, it's not necessary that there will be a higher standard in MBA. Mostly, it depends on which college you are doing it from. You can go for M.Tech.

For communication and other soft skills, it is better to do some course on Coursera or other online platforms. For technical skills, take admission in the course which is more interesting to you.

Hello Avadhesh,
It's very nice to see your dream of seeking admission in IITs or NITs. The situation is that IITs accept Diploma as equivalent to 12th but unfortunately NITs do not. Hence, tighten your belt and go all out with aim of clearing JEE Mains and JEE Advanced with good marks so that you will get admission in an IIT. Also, don't forget to score more than 75% in your Diploma.

Opt for the course that you love the most and are most passionate about and analyze the future work conditions, scope and growth prospects before taking admission. You can also opt for psychometric test comprising of aptitude, personality and career interest to clear confusion.