>>12732089learn to rate the texts. some lengthy texts are ultimately not worth working through, some are intended to be used as a reference book. some texts are too hard for you at the moment, so even if you read them, you'll struggle very hard with understanding them. before putting your focus into a text, learn to assess if the text is worth your time.
if it is, you still normally won't be able to cruise through it. break it down into digestable pieces, but try to work on these pieces on a regular basis; and yeah, solve the exercises.
also, translating the book into another language when you have good science editor friends is great if you want to really get into a book.