Hello student,

It will be helpful if you specify the stream you are in so that I can tell the syllabus of subjects which are relevant to you. I am writing below the main topics of all the subjects in 12th standard.

You can check the link given below and see the syllabus of subjects that are relevant to you.

https://www.google.com/amp/s/school.careers360.com/articles/bihar-board-12th-syllabus/amp

I hope this information helps you.