GCSE revision

hiya, unfortunately i haven’t been doing great with consistent revision but i’m finally now going to lock in and start for sure. but i just wanted to ask if i should start doing past papers for subjects we haven’t done all the content for. in the sense that: we’ve covered all the paper 1 content but not paper 2. should i start doing paper 1s or wait for paper 2 to be done as well??
if someone could help me out thank you sososo much x

I'd start paper 2s as well and just ignore anything you haven't yet covered.