Colleges in Bangalore

Any Diploma programme has to be of at least one year's duration and a stock market is a vast field.
National Stock Exchange (NSE), as well as The Bombay Stock Exchange (BSE), offer various courses.
The NSE courses are broadly classified as
Certification on Equity Portfolio Management
Certified programme on Live Trading Strategies
NSE Academy's Certified Capital Market Professional
and Online NSE Academy's Certified Capital Market Professional. You may also check with Garware Institute, University of Mumbai.

No, Wisdom School of Management, Bangalore does not offer DME course, for details around courses offered, check out the link below:
https://www.shiksha.com/college/wisdom-school-of-management-bangalore-indiranagar-37032/courses?ct[]=278&lo[]=111

Should have completed 12th standard CBSE or equivalent qualification.

XIME, Bangalore is an awesome college in Tier-II colleges.
The college has good industrial connect as it's situated in Electronic city being one of the reasons.
The college is in process of tie-up with GE for some of the elective courses which would be completely handled by GE from faculties to projects to exams.
The placements are going good for the year and few companies are lined up.
If you have any specific query, you can ask.

Alliance is better in terms of academics among the mentioned above. They have quite qualified faculty members.

These are some of the colleges:
CMAT
MAT
NMAT
CMAT

Yes,Reva University accepts any equivalent 10+2 exam for degree courses.

You don't need to write JEE or DCET.
You are eligible to apply for a lateral entry. But not all colleges have such window. Look for a college that have a window.

Yes, you can get admission by applying for COMEDK exams. These exams too work similar to KCET on ranking basis but are for students from outside Karnataka.