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The LMS natively provides two ways of automatically grading multiple choice questions with multiple correct answers:

• All or Nothing
• Uniform Partial Credit

You can select the method to use, which applies to all exams, in the Grading for Multiple Choice Questions System Configuration setting. 

With All or Nothing enabled, automatic grading awards either zero or full points, depending on whether the participant answered the question exactly as required.

With Uniform Partial Credit enabled:

• Automatic grading awards a fraction of the points for each choice response, where each correct choice is worth a fraction of the total points available for the question.
• If a question is unanswered (that is, no choices checked), zero points are awarded.
• If all choices are selected when only some are correct, the LMS assumes the user is guessing and zero points are awarded. If all choices are required for the correct answer then full points are awarded.
• If no correct choices are selected, zero points are awarded.

Where a multiple choice question has five answers, A to E, and answers A and B are correct, the table below shows how points are awarded for different answer combinations. 

If penalty points are configured for an exam question, each incorrect choice within that question is proportionally penalized. For the overall result, a question will always return a value that is between 0 and the full weight. In the example below, no penalty points are configured for the question.