GCSE Maths: which past papers should I do?

I'm doing a new specification for GCSE Maths (linear) so I only have 2 past papers.

Therefore, should I do Linear past papers from the old specification or would it be better if I did Modular past papers from the current specification?

I would not say do past papers, since there are not a lot of them But I would recommend just doing questions, use mathswatch (very useful).

Are you doing the edexcel course by any chance?