Teaching & Education

Subject selection should be according to your educational qualification.
The course you have opted for at Master's level will be more better to select as subject for the NET exam.
If you have studied in science field, you can give CSIR-NET otherwise UGC-NET exams.
Exam is conducted twice in a year - one in June & other in December.
For June exams, the forms were already out & date of filling up the form is closed. You can try for December exam.
For more details of the exam, kindly visit their official site for the same.
http://www.ugc.ac.in/inside/net.html
http://www.csirhrdg.res.in/

Not for all states, Infact if you check KVS and JNV website, you are going to find that you are not eligible for TGT SST but as per the last notification of Delhi Government (2012), you are eligible on the bases of business studies and economics. It is better to go for M.Com as it will help you in finding a better job.

Definitely, it will be. B.Ed itself open doors for teaching as a graduate in education. Diploma itself has limitations in terms of job as well as course content. Moreover, you might not be able to crack WBSSC. In any case, if that happens, you can opt for teaching with TGT and can get a better salary than D.El.Ed.

Yes, your qualification is sufficient to be employed as teacher in government schools provided that you have cleared any entrance or eligibility test (if organised by that state or central government). I would suggest for further promotions or for high salaried teacher job pursue any master degree. Any specialisation in any particular field will also get weightage. Smart classes are now becoming integral part of our education system.

You can opt for SIX sigma training for trainers. This will help you go into training & development.