You might be off the pace by 1 mark in April but meet the pass mark in May. As the Judgment notes in paragraph 149:
149. The Tribunal found that, as a matter of logic, having two opportunities to
pass an exam which tests the same knowledge is of benefit and does give the
candidate an additional chance to pass the relevant exam. It also reduces the
chance of external factors detrimentally affecting a candidate’s performance. If a
candidate is ill on one day, or has other factors affecting their performance, they
have a chance, a month later, to sit an exam testing the same knowledge, when
those external factors might not be present.