I recommended all subject new syllabus collect from their respective school. So look the Govt. notification or authorize department. Follow the admission news for class eleven.(News from Govt of W.B.S.E.Dept.)
'Now after careful consideration of the matter, the State government in the school education department has decided that a student, who has secured at least 70% marks in the aggregate and 75% marks in science subjects and mathematics taken together in the madhyamik examination. Under the W.B.B.S.E. will be entitled at his/her option to get admission in the science stream in class-XI from the same institution from where he/she has completed and passed the Madhyamik (Secondary) course and examination provided the institution is a Higher Secondary School and that it has appeared Science stream at the Higher Secondary level. All news from Government of West Bengal School Education Department Higher Secondary Branch'.
Now given below a site link. You may collect New Syllabus for all subject of Class XI eleven, West Bengal H.S. (10+2) Students of W.B.C.H.S.E.
Now you can collect the new syllabus for all subjects from this Link site.