CBSE 12th

Hi Akshit,
There is not any limited chance of cnse improvement you may give it as many time you want and for JEE you attempt it for 3 times only.
Best of luck

For Odissa - click on the link to know more:
http://www.studyguideindia.com/Schools/boarding-schools-orissa-or.html
For West Bengal - click on the link to know more:
http://www.studyguideindia.com/Schools/boarding-schools-west-bengal-wb.html

Have you taken the aptitude test to know your aptitude. Find out the reason as to why have you lost interest.

You can study CS in B.Tech even if you have not taken CS in school. Any way, the basics will be repeated again in the 1st semester - so not so difficult to grasp.

Which stream are you from- science, commerce or arts?

Following are career options for commerce students after 12th class:
(a) B.Com or B.Com Hons
(b) BA Economics or B.Com Hons Economics
(c) BBA/ BMS/ BBE/ BFIA etc
(d) BCA if student had Maths as optional subject in class 12th
(e) Five years integrated law
(f) NDA or Non-Commission jobs in Defence and Paramilitary services
(g) Hotel Management
(h) CA or CS
(I) BA in Mass Communication
(j) BA Vocational in Office Admin
(k) Job in group C services of Government
(l) Change to Humanities stream
You may chose any based on your interest to excel