I hear you, and I want to help get this sorted out. This is usually caused by a browser session glitch, a lockout period between attempts, or a mismatch in which module is being referenced.
To ensure we're aligned, I'd like to know more about the challenges you are facing.
What product or certification are you referring to in Section 4? Is it ProAdvisor certification, a payroll module, or a QuickBooks training course?
When you're marked as failed, do you get a specific error message, or just an overall "failed" score with no detail on which questions were wrong?
Were all six attempts recent, say today or this week, or spread across multiple days?
It would also help if you could share a screenshot so we have a clearer picture of the situation.