In desperate need of a study tip!! ASAP!

Hello everyone,

In high-school we have this subject, business administration, and I have no idea how to study for it. The book is technically a ton of theory but also a lot of useless examples. What I've been doing till now was writing all the important stuff on paper using the Promodoro Technique, which clearly wasn't helping since I failed all exams in this subject. We have at least 100 pages for each exam, and while I'm writing things down for days, I don't seem to memorize anything. Tomorrow I have to write another exam, that's supossed to raise my grade a little. Any tips on how I could study efficiently??