had to rely on the information handed down, and so much has turned out to be downright lies, the rest just often misleading.
Indeed, and you are right to be angry. But I think you're angry at the wrong people. A lot of the things you rail against (picking out examples, BTECs, subject choice, further maths) have been true since forever. Getting into a selective university with BTECs (previously HNCs or whatever) has always been hard. Doing the right A Levels has always mattered. Further Maths has always been a good idea for pretty well any STEM degree.
When Conservative education secretaries say this, the cry of "elitism" comes from the left and the teaching unions (as if they're distinguishable). The people who are happy to see schools with predominantly working class intakes teaching subject and qualification mixes that virtually guarantee that you cannot attend any selective university are not, in general, Michael Gove's acolytes. The push for "relevant" and "applicable" (ie, low status) qualifications has come from bien pensant educationalists who think that working class children are only capable of qualifications that the educationalists themselves would reject out of hand for their own children.
If someone said they were opening a school where the only A Levels available were English, History, French, German, Maths, Further Maths, Physics, Chemistry, Art and Music, with AS Biology available for prospective medics, they would be laughed to scorn. But (waves hands, waits for counter-examples) those A Levels cover the entry requirements for 95% or more of all degrees in the country. How many degrees can't you apply for with three A Levels out of that set? One of the classics streams at Cambridge requires you to have A Level Latin, there's presumably a few MFL degrees that require the matching A Level (but no school can offer all the possibilities), and what else?
Teaching any A Levels outside that set (plus, possibly, straight Economics) is a dubious endeavour: it doesn't open up any options (again, I await correction) and generally closes options down. Your local independent school, feeding most of its pupils into top universities, essentially offers two choices: "English, History, an MFL" and "Maths, two sciences, plus either a third science or further maths". That's it. Even if you don't go to university, those are the A Levels employers want.
But imagine your local comp switched to that curriculum for all its A Level candidates. Can you imagine the howls of "elitism" and "what use are those subjects?" and "where's the Business Studies and ICT and Photography and Law and Sociology?" More to the point, can you imagine the howls of "fucking Gove?"
The villains of this piece aren't the government. It's a bunch of people working in education who decided that if your mother has her hair in a scrunchie and you're on Free School Meals, you can't understand further maths and wouldn't know what to do with it anyway. And that plays well with some parents (some parents, obviously not you) who would say "further maths, what's the good of that?" And we end up with a two tier education system, which you are absolutely right to be extremely cross about. And it's voices like yours which need to be heard.
Calculator? Casio FX83 is fine.