I'm currently in class 12th and my aim is 12th boards and bitsat. I am starting my prep from scratch so I need advice on whether I should watch lectures from pw online or instead I should refer to books, like reading theory from hcv, understanding that and making notes from it then doing its questions. I feel that it would help me to read instead of watching like 16 lectures of a single chapter but my concern is that what if not everything is covered means something like that. So should I watch lectures or read from books?