The ACCA do not publish past exams for Papers MA and FA, so they are not available. (Part of the reason is that everyone gets a different exam because the questions are selected from a large bank of questions by the computer 🙂 )
For practice (after you have finished studying for the papers) you need to buy a Revision Kit from one of the ACCA Approved Publishers (BPP or Kaplan). They are full of exam standard questions (and answers) and practice is essential to passing the exam.