Hi Yen,
IMA website does not provide sufficient study materials but it does provide a guideline. You can purchase any third party exam prep courses like Becker or Gleim.
If I may suggest, focus on key concept and try to solve as many MCQs as you can. Shuffle the questions for better understanding, use flash cards etc as well. All while trying to acheive at least 80% score. Finally complete your study at least one month before your exam date. Last month you should dedicate for Essay type and more MCQ questions.
Good luck.
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Muhammad Haris
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