Information Technology

First of all, set priorities to the things you want to do. Then, you may do the first two things in parallel. All the best for your future.

Admissions are done through TN-LEA counseling based on marks obtained in diploma examination.

I doubt, if you'll be granted admission based on your class 12th class percentage. I would suggest you to once get in touch with the admission committee of the college and explain your situation before applying.

Yes, it does provide BCA in its Amethi campus.

You have the two ways for B.Tech lateral admission as following-
1. Lateral admission through SET
2. Lateral admission through MHT-CET
Because, you are already in Symbiosis. Hence, you may opt for SET.

The cut-off for General category was 98.
OBC- 60
SC- 60
ST- 40

You can find all the information on this link:
https://www.shiksha.com/it-software/cloud-computing/course/bca-with-microsoft-cloud-computing-and-cyber-security-sjes-college-of-management-studies-old-madras-road-bangalore-233845

It depends on the college you are trying to apply. So, please specify the college name and for a rough idea it will cost you around 15 lacs in the tier two colleges. Reply to your comment:- for BCA+MCA in LPU Delhi you will need 4.5 lacs to 6.5 lacs. And integrated MCA will add some 50000 more to your cost of study. Upvote the answer if you are satisfied with or comment down if you need any help.

You need to register and apply. There is a written test that you need to appear for and the test is conducted by the GICED. After shortlisting, you will be called for personal interview based on marks obtained in written test. The final selection will be based on your performance in both, personal interview and written test.