You need to study all areas of F7 but PPE and basic financial instruments are regularly seen and examined in more complex scenarios than F7. Don’t neglect IAS 37 and IAS 10 as they are only small but make regular appearances too.
Ultimately there is no quick way round the F7 knowledge, you need to maintain it all for P2. Don’t stress that you haven’t done it for a while as it will come back to you as you go through the videos and work through the past exam questions.