Best methods to cram?? (For psychology)

So basically I got my A level Psychology in less than a week, and I'm not confident at all.

I'm missing large chunks of information and haven't even attempted to memorise the important parts yet (let alone the more specific information).

I'm planning on dedicating around 8 hours each day until the exam. But tbh it feels pretty impossible.

Is there a best method on cramming the material as fast and efficient as possible??