Another difficulty and ability recalibration run

I have completed another recalibration of question difficulties and student ability estimates using the latest attempt data. As more students complete papers, this gives us more evidence to refine the estimates. I have also upgraded the grade boundary files for my mocks and Jackie Tyler's mocks.

You may notice a small change in your mastery score, even if you have not submitted another paper. This is expected: your previous answers are now assessed against the updated question difficulties.

If you notice any numbers that look strange, or a change that seems unexpectedly large, please let me know so I can investigate. Thanks to everyone using the simulator and helping improve it!