This page has links to A Level past papers and solutions. STEP and Oxford Admissions test links are at the end of the post.
See also the related pages Notes and Videos.

Exam Solutions
Exam Solutions has thousands of worked video solutions to A Level questions. Note the tabs at the top of the site, select A-Level Maths and then your chosen exam board.
Revision by topic:
crashMaths AS Pure Maths Key Skill Checks
Edexcel
AS and A Level Mathematics Sample Assessment Materials Exemplar answers
with examiner comments – Pure Mathematics
AS and A Level Mathematics Sample Assessment Materials Exemplar answers
with examiner comments – Statistics and Mechanics
The Edexcel examining team have selected student responses to all questions from the trial of the Sample Assessment Materials. For each question, very clear mark schemes are given for that question and then a range of student responses with accompanying examiner comments on how the mark scheme has been applied and the marks awarded, and on common errors for this sort of question.
UK Legacy Examination Materials
OCR (MEI) papers & mark schemes
From David Smith:
OCR (MEI) C1, C2 & S1 papers and solutions
OCR (MEI) C3 & C4 papers & worked solutions
OCR (MEI) M1 FP1 FP2 S2 papers & worked solutions
MEI Revision Videos – Further Mathematics Support Programme
OCR Maths papers and mark schemes
AQA – questions by topic – The Chalkface
Edexcel papers and mark schemes
Worked Edexcel Solutions – Maths Genie
For an additional source of questions and full solutions for the Pure Maths content of A Level exams see MadAsMaths.
Sixth Term Examination Paper (STEP). The Preparing for STEP section includes papers and mark schemes.
Advanced Problems in Core Mathematics – Stephen Siklos
For an extensive collection of Challenging questions for Advanced Level students we can turn to the Oxford Maths Admissions Test, note the menu on the right hand side of the page, many papers and also solutions are available.