Reddit reviews Talking Pictures: How to Watch Movies

Understanding film beneath the surface level is what I would suggest. There are a lot of books for that type of thing. I'd recommend the new Talking Pictures: How To Read Movies, it's very easy to read in comparison to the more Film Studies textbooks. But beyond becoming more knowledgeable in Film in general, working on your writing will help convey your thoughts and feelings into words as best as possible. Resources at your school (English teacher) could be of great value. As far as things you can do on your own, I find Naked, Drunk, and Writing to be great for this kind of thing. Or any books focusing on writing skill pertaining to reviews/essays and the like. Both books are easy enough for someone your age to understand. Good luck!!