Diploma

Engineering colleges/universities offering LEET admissions are:
* Punjab University - Chandigarh
* IP University - Delhi
* Delhi Engineering College - Delhi
* Punjab University - Patiala
* KIITS University
* Thapar Institute of Engineering and Technology - Patiala
* Government College of Engineering - Pune
* Punjab Technical University - Jalandhar
* Guru Nanak Dev Engineering College - Ludhiana
* Sant Longoval Institute of Engineering and Technology - Sangrur
* Anna University – Tamil Nadu, etc.

MBA has better scope than any other Diploma courses.

Yes, you can do that because many universities like IGNOU consider engineering Diploma after completing class 10th as equivalent to class 12th.
Good luck.

Both the courses are very good, but if your PCM is not strong, then you should opt for hotel management course.

If you are interest in computers, then you can pursue MCA in distance. Some universities takes class 12th non-mathematics graduates with a mathematics bridge course along with 1st year MCA. If not, then you can do Diploma in engineering through distance mode in other interested branch.

You can do PG Diploma in Software Engineering but you may face challenges in job. Indian IT industry now prefers B.Tech CS/ IT or MCA or M.Sc CS /IT for jobs. It is recommended that you evaluate BA certifications from IIBA to join IT industry as Business Analysis.

I don't think there is a possibility to change the branch in B.Tech

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