S1 Edexcel Papers - PMT - physicsandmathstutor S1 Edexcel past papers and mark schemes. You can find S1 Edexcel past papers (QP) and mark schemes (MS) below. There are also model answers (MA) provided by Arsey from The Student Room. Edexcel – S1 June 2014 | ExamSolutions @tim_critt Unless it is differentiation from first principles. 3 weeks ago; @tim_critt Then, I am sorry but I do not have anything on this that will help. 3 weeks ago; Did not like the mark scheme version for this specimen question so made an alternative version. Any comments?