D1 Edexcel Papers - PMT - physicsandmathstutor You can find D1 Edexcel past papers (QP), answer booklets (AB) and mark schemes (MS) below. There are also model answers (MA) provided by Arsey from The Student Room. Papers from 2008 and before include questions on flows and simplex algorithm, which is not in the current syllabus.[PDF] Mark Scheme (Results) Summer 2013 - Summer 2013 GCE Decision Maths D1 (6689/01R) EDEXCEL GCE MATHEMATICS General Instructions for Marking 1. The total number of marks for the paper is 75. 2. The Edexcel Mathematics mark schemes use the following types of marks: candidate’s response may differ from the final mark scheme. Question Number Scheme Marks 1.