BMQ testing is as follows:
PO 101 Apply General Military Knowledge - Oral EC's
PO 102 Operate the Service Rifle - Handling Test & PWT Level 1
PO 104 Perform Drill - Practical PO Check
PO 105 Administer First Aid - Written Exam (Part 1 & 2) & Practical Evaluation after each EO
PO 106 Survive in a Field Environment - PO Checklist
PO 107 Operate under NBC Conditions - Written Exam & Practical Evaluation (GAS HUT)
PO 109 Maintain Safe Working Environment - Written Exam & Practical Evaluation throughout the course
EDO 101 Describe the Law of Armed Conflicts - Discussion
EDO 102 The Origin and History of the Canadian Army - Reading Assignment
As you can see there are only three written tests that count for you passing the course, the rest are practical or participation. The pass mark is only 60% less First Aid which is 70%. The staff may use quickie tests to evaluate your learning, but they don't count (you still want to do well as it could reflect a bad attitude otherwise).
If anyone is going to get stressed out about how difficult a course is, they should pick something other than BMQ. BMQ is quite likely the least mentally challenging military course you will ever take. You may find it physically, emotionally, socially etc demanding - but not mentally.