B Black: All test
questions answered without errors.
G Green: All test questions answered with errors.
Y Yellow: At least one session of questions answered.
R Red: No test session taken.
B x: Number of times
Black has occured.
G x: Number of times Green has occured.
When a test is reset to zero questions taken,
the color becomes red again onless it has once been green or black.
If both green and black exist, the newest is used.