does anybody know where I can access past mock papers (preferably this years) for HL LC maths?
You can get all the past examcraft papers on http://pastpapers.ie for a euro of two each. There's a minimum order of €5 though so you're better off getting them all the ones you need in the one go.
http://www.themathstutor.ie/official-marking-schemes.html I don't know if this will help???