CBSE 10th

NDA is the best option. Strat preparing for NDA this time. After 12th you are eligible for NDA.

Yes, SIES PGDM has equal weightage for GDPI as well as for entrance exam. Last date of form filling is 4th April.
For further information about admission process visit:
http://www.siescoms.edu/

You have to be good in GD/PI for doing PGDM from SIES. GD/PI and entrance exam have equal weightage. So there is no such cutoff for any entrance exam.

Yes, there are chances for SIESCOMS.
SIES has equal credit for GD/PI as well as for the entrance test as your entrance exam score is not so good. So for SIES you need to more concentrate on GD/PI process.
Last date of form filling is 4th April.
Further information available on:
http://www.siescoms.edu

Hi Jini,
Any graduation degree holder is eligible for CAT.
After qualifying CAT, you can get admission in IIM.
All the best.

Hello Mr. Subhro,
From my opinion you can go for integrated MBA (BBA + MBA) of 5-year through distance learning mode.
For DMS check out the below link:
http://www.ignou.ac.in/ignou/aboutignou/school/soms/programmes/detail/198/2

Following is the link for the best colleges in Bhuvneshwar for Diploma in Mechanical Engineering you can find there when to apply for it.
https://www.shiksha.com/search/?q=Diploma+in+mechanical+engineering&sp[]=324&qer=0|0|0|0|0|0|324|0|0|0|0|0|0|0|10|0&sa=912^^0^0^324^0^0^0^0^0^0^0^10^0^0&rf=searchw

Diploma in food technology students have good job opportunities in the present time where there are numbers of companies, large and small scale, which are involved in processing and packaging of the food products for the consumer. The fields where you can find jobs are:
Catering establishments
Hospita

If you have done Diploma in engineering of 3 years then you can take direct admission to 2nd year of engineering.

It's your choice if you balance between your school study and JEE preparation then you can start preparing for it in class 10th.