When IMC examinations are constructed, an average difficulty for the whole examination is established and this determines the pass mark. The average difficulty may vary slightly from one examination to the next, but this is carefully balanced by slight variations in the pass mark using psychometric analysis.

Although the pass mark is not rigidly fixed (for the psychometric reasons stated), the pass mark for the Unit 1 exam seldom varies from between 65% and 75% of all scored questions.

The pass mark for the Unit 2 exam seldom varies from between 60% and 70% of all scored questions.