CTET

Yes Sanjeev, since you have done B.Sc and B.Ed both, you are eligible for CTET and state TETs (of whichever state you are eligible to appear in).
For KVS, you'll be eligible for the post of PGT and PRT teacher, once you qualify the CTET exam.
You can read the eligibility criteria in detail on the foll

There is no other scope for commerce subjects from class 5th to 10th, either in CBSE or State government schools. But as you have economics, you can choose history, geography or political science, then you can appear in TGT and CTET for social sciences.

Yes you can apply for CTET if you are in the final year of B.Tech.

The following persons are eligible for appearing in the CTET.
(A) Minimum Qualifications for becoming Teacher for Classes I-V: Primary Stage
Senior Secondary (or its equivalent) with at least 50% marks and passed or appearing in final year of 2- year Diploma in Elementary Education (by whatever name

No, you need not do D.El.Ed again. It is required for those teachers who are teaching in government schools without any training.

You should be a graduate to appear for CTET as per my knowledge. For further details kindly visit the website of CTET. I hope this would suffice.
All the best and god bless you.

Yes,
The CTET will be valid after clearing B.Ed.
For details and better understanding please refer the link:
http://ctet.nic.in/CMS/Public/View.aspx?page=39

Kindly refer to the link below:
http://ctet.nic.in/CMS/Public/View.aspx?page=39