which subject should i choose in XI?

This is a dilemma that students of your age usually face. SO dont worry this is perfectly normal. But this has to be resolved. In order to resolve this you need to "be aware".

Be aware or the careers available and also be aware about yourself. Firstly in order to know more about careers you have an easy access to call kinds of career information on http://www.youngbuzz.com/careers/career-options So feel free to log on to it to know about the careers and their details like career scope,career map,remuneration,benefits etc.

And in order to know more about yourself you can give the career test available on http://www.youngbuzz.com/career-assessment/role-assessment-career-counselling

To tell you a little about the tests-these are aptitude,interest and personality test which will help you know about your likes/dislikes in terms of the careers,they will tell you more about your strengths and development areas in terms of your aptitudes and also about your personality traits. Once you take the test, the report is generated and you get the report with 3/4 career recommendations based on the test that you give. The recommendation are given by the expert career counselors
at YoungBuzz.

you can also check a sample report of the career test on the  by hitting the above link. Surely this will help you make a wiser and informed career decision.