hi,

see some  of the schools of higher secondary at west bengal under wbchse offers english version classes for students in 10+2 course. so at the starting of 11th you may take english version to complete you 12th course. another option is you have to remember the english terms and frequently check for questions and try to solve mcqs from the books like arihant or tata macgraw. it will be not easy and takes time. so if you are currently studying 8 hours per day, you have to give extra effort and take 2-3 hours more to study.

I Suggest to follow any standard books and make a routine for daily work and studies.