I had 4 A's 3 B's and a C at GCSE and 1 A, 2 B's at A-level but that was back in the early 1990's when exams were exams unlike now
There's actually hardly any difference in the level of difficulty between Maths (Further Maths), Physics, Chemistry and Biology, to name a few A-Levels, now, to when you took them in the 90s.
Of course there may be 1 in 4 people achieving a Grade A at A-Level now, but that's not due to the Science/Maths A-Levels getting easier, it's due to the introduction of 'softer' subjects, such as Photography, Sociology, Accounting, Media Studies for example, courses that originally were aimed at lower-achieving Students, but have caught on and have overtaken Science/Maths.