GCSE grade boundaries

So somebody told me (not a teacher) that if took any people get a question/s wrong on any particular GCSE exam, the exam board will lower the grade boundaries for that entire year. So like if the previous grade boundary was 70% for an A it could change to like 65% for an A If too many people find the question paper hard. A bit of a long winded message but basically the bottom line is ‘does the exam board actually lower/raise the grade boundaries after the results?’ Thanks

So somebody told me (not a teacher) that if took any people get a question/s wrong on any particular GCSE exam, the exam board will lower the grade boundaries for that entire year. So like if the previous grade boundary was 70% for an A it could change to like 65% for an A If too many people find the question paper hard. A bit of a long winded message but basically the bottom line is ‘does the exam board actually lower/raise the grade boundaries after the results?’ Thanks