What CB said, added to what SC said. I started teaching in 1981 and I still have the old exam papers from that year onwards. The difference in standard between then and now is embarrassing.
In my subject they simply miss out the difficult bits so more people can pass, then they claim standards are rising. Absolute shoite.
Also the young people have been weaned on a culture of 'is this in the test? Then why are we doing it?' And also 'I couldn't do that question. You never taught us that. It must be your fault'.
I started to have my suspicions a few years ago when I gave some first years a test. After they got their marks back they asked 'when are we doing the test again?' I was baffled at first, then I realised they had been brought up in a primary system where they did a National Test repeatedly until they scraped a pass. So I get a bunch of S1 kids who have passed at level D but are no more able to understand level D work than fly in the air. But try telling their parents that.
Back in the good old days they had the Scottish Examination Board, a respectable institution. Then in the mid 80s along came Scotvec, a sort of privatised vocational body which was very fond of internal assessment so the responsibility was thrown back on to the teaching staff. Now we have the SQA, which is simply the bastard offspring of the two and seems to be all about making money.